Please calculate the thickness that 80.0 percent of the products thicknesses are thinner than or equal to.
Q: The weight of a type of dog follows Normal distribution with mean of 10 pounds and standard…
A: Given Information:
Q: What is the value of the 95th percentile
A: Given that X follows N(mean = 500, SD = 40), then Z = (X - mean)/SD follows N(0,1)
Q: The average score on one of your MMW exams was 70 with a standard deviation of 15. Assuming the…
A:
Q: The average score on one of your statistics examination was 75 with a standard deviation of 10. If…
A: Given that the average score on one of your statistics examination was 75 with a standard deviation…
Q: The scores on a standardized test are normally distributed with a mean of 115 and standa deviation…
A: Z = 2.2 , μ = 115 , σ= 15
Q: Find the proportion of Normally distributed observations with a zz-score above 0.84. Give your…
A: Let Z be the random variable from normal distribution with z-score above 0.84 then we will find the…
Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…
A: Given that, The scores on a standardized test are normally distributed with, Mean = 95 Standard…
Q: The scores on a standardized test are normally distributed with a mean of 105 and standard deviation…
A: Let X denote the scores on a standardized test. Given that X follows N(mean = 105, SD = 10)
Q: Let us suppose that the amount of bread consumed by adult Americans per day can be modeled by a…
A: Given: Mean(μ) = 32 oz Standard deviation (σ) = 13.3 oz
Q: The mean mass 30 birds is 650 g with standard deviation 4. The second group of 90 birds has a mean…
A: Given n1=30, X1bar=650,sigma1=4 n2=90, X2bar=660, sigma2=4 We want to find the combined standard…
Q: The mean or average age for a jail inmate back in 1978 to have started using cocaine on a daily…
A: Introduction: Denote X as the age of a randomly selected jail inmate in 1978 at which they started…
Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…
A:
Q: When Julian runs the 400 meter dash, his finishing times are normally distributed with a mean of 82…
A: Given that The finishing times are normally distributed. Mean (μ)= 82 seconds Standard deviation…
Q: Suppose the mean height for men is 70 inches with a standard deviation of 2 inches. What percentage…
A: we have to find probability factor and from it value we get value of percentage X = 74 μ = 70 σ = 2…
Q: The mean weight of 500 male students at a certain college is 151 lb and the standard deviation is IS…
A:
Q: The scores on a test are normally distributed with a mean of 110 and a standard deviation of 22.…
A: Let X be the random variable from Normal distribution with mean (μ) = 110 and standard deviation (σ)…
Q: The volume of water in commercially supplied fresh drinking water containers is approximately…
A: Given,mean(μ)=70standard deviation(σ)=0.75
Q: The average score on one of your MMW exams was 70 with a standard deviation of 15. Assuming the…
A:
Q: Last year, the mean salary of accounting clerks was $29932. If we assume that the annual salaries…
A: Given Data: Let X represent the random variable X~ Normal (29932, 18502)
Q: The scores on a standardized test are normally distributed with a mean of 120 and standard deviation…
A: From the provided information, Mean (µ) = 120 Standard deviation (σ) = 10 The test score is 2.1…
Q: A set of elementary school student heights are normally distributed with a mean of 105 centimeters…
A: Solution: Let X be the height of student. From the given information, X follows normal distribution…
Q: The scores on a standardized test are normally distributed with a mean of 105 and standard deviation…
A: Let k is 0.6 standard deviation below the mean. That means -0.6 is the z score of the value.…
Q: The monthly income of trainees at a local mill is normaly distributed with a mean of $3300 and…
A:
Q: The scores on a standardized test are normally distributed with a mean of 85 and standard deviation…
A: If X be the scores. It is known- X~N85, 202 where, m: mean = 85 s: standard deviation = 20
Q: Assume that at the average age of a population of wild turtles is normally distributed with mean age…
A:
Q: For a random sample of 90 overweight men, the mean number of pounds that they were overweight was…
A:
Q: The scores on a standardized test are normally distributed with a mean of 110 and standard deviation…
A: The given information is that the score on a standardized test are distributed normally with mean…
Q: The scores on a standardized test are normally distributed with a mean of 80 and standard deviation…
A: we have to find raw score ...
Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…
A: Let "X" be the test score. Find z-score (z): The z-score is the measure of how far the standard…
Q: A paint manufacturer discovers that the mean volume of paint in a gallon sized pail is 1 gallon with…
A:
Q: A lightbulb is advertised as lasting 1000 hours with a standard deviation of 150 hours. Assume the…
A: It is given that the mean and standard deviation are 1,000 and 150, respectively.
Q: The amount X of orange juice in a randomly selected container varies according to a normal…
A: Given that, The amount X of orange juice in a randomly selected container varies according to a…
Q: The mean growth of the thickness of trees in a forest is found to be .5 cm/year with a standard…
A: Solution: Given that : μ= 0.5 Population mean σ= 0.1 Population standard deviation
Q: The percentage of area under the normal curve between the mean and 0.8 standard deviations from the…
A: The percentage of area under the normal curve between the mean and 0.8 standard deviations from the…
Q: Solar earned a score of 940 on a national achievement test. The mean test score was 850 wth a…
A: Given that Solar earned a score of 940. The test scores are normally distributed. Mean test score…
Q: The width of an A4 piece of paper is normally distributed with a mean of 210 mm and a standard…
A: The width of an A4 piece of paper is normally distributed with a mean of 210 mm and a standard…
Q: The scores on a standardized test are normally distributed with a mean of 120 and standard deviation…
A: Solution: Let X be the score on a standardized test. From the given information, X follows normal…
Q: During 1 week an overnight delivery company found that the weights of its parcels were normally 20oz…
A: According to the given information, During 1 week of an overnight delivery company found that weight…
Q: A popular fashion magazine claims that the age of their subscribers is normally distributed with a…
A:
Q: The scores on a standardized test are normally distributed with a mean of 80 and standard deviation…
A:
Q: The thickness of a part is to have an upper specification of 0.925 and a lower specification of…
A:
Q: The systolic blood pressure of adults in the USA is nearly normally distributed with a mean of 117…
A:
Q: The Principal decided that the top 30% of the class with the highest grades in statistics will be…
A: Given that, μ=80.51σ=10.2 Consider that the top 30% of the class with the highest grades in…
Q: The scores on a standardized test are normally distributed with a mean of 90 and standard deviation…
A: Since z-score is the measure of how far is the standard deviations from the mean. Z-score would be…
Q: The distribution of the amount of money spent by students on textbooks in a semester is…
A:
Q: The scores on a standardized test are normally distributed with a mean of 80 and standard deviation…
A:
Q: The scores on a standardized test are normally distributed with a mean of 120 and standard deviation…
A: Given that, μ=120,σ=5,z-score = 1.1 The formula for calculating the test score is
Q: he average waist size for teenage males is 29 inches with a standard deviation of 1.4 inch. If…
A: Given data,Mean μ=29sd σ=1.4P(X>31)=?
Q: A study reported that the mean concentration of ammonium in water wells in the state of Iowa was…
A: Let X be the random variable which is defined as the concentration of ammonium in water wells.It is…
Q: The time needed to find a parking space is normally distributed with a mean of 20 minutes and a…
A: 90% of the time, it takes less than 26.63 minutes to find a parking space. Explanation is given…
An insulating material process produces sheets whose thickness is lognormally distributed with mean, μ = 8.5 inches and standard deviation, σ = 2.0 inches. Please calculate the thickness that 80.0 percent of the products thicknesses are thinner than or equal to.
Step by step
Solved in 2 steps with 1 images
- Can the average rate of change of a function be constant?A photoconductor film is manufactured at a nominal thickness of 25 mils. The product engineer wishes to increase the mean speed of the film, and believes that this can be achieved by reducing the thickness of the film to 20 mils. Eight samples of each film thickness are manufactured in a pilot production process, and the film speed (in microjoules per square inch) is measured. For the 25-mil film, the sample data result is = 1.15 and 81 = 0.11, while for the 20-mil film, the data yield 2 = 1.06 and 82 = 0.09. Note that an increase in film speed vould lower the value of the observation in microjoules per square inch. (a) Do the data support the claim that reducing the film thickness increases the mean speed of the film? Use a = 0.10 and assume that the two population variances are equal and the underlying population of film speed is normally distributed. What is the P-value for this test? Round your answer to three decimal places (e.g. 98.765). The data the claim that reducing the film…A photoconductor film is manufactured at a nominal thickness of 25 mils. The product engineer wishes to increase the mean speed of the film, and believes that this can be achieved by reducing the thickness of the film to 20 mils. Eight samples of each film thickness are manufactured in a pilot production process, and the film speed (in microjoules per square inch) is measured. For the 25-mil film, the sample data result is = 1.13 and 81 = 0.11, while for the 20-mil film, the data yield = 1.08 and 82 = 0.09. Note that an increase in film speed wwould lovwer the value of the observation in microjoules per square inch. (a) Do the data support the claim that reducing the film thickness increases the mean speed of the film? Use a = 0.10 and assume that the two population variances are equal and the underlying population of film speed is normally distributed. What is the P-value for this test? Round your answer to three decimal places (e.g. 98.765). The data v the claim that reducing the…
- The molecular weight of a particular polymer should fall between 750 and 1,035. Thirty samples of this material were analyzed with the results X-bar = 902 and s = 90. Assume that molecular weight is normally distributed.A photoconductor film is manufactured at a nominal thickness of 25 mils. The product engineer wishes to increase the mean speed of the film and believes that this can be achieved by reducing the thickness of the film to 20 mils. Eight samples of each film thickness are manufactured in a pilot production process, and the film speed (in microjoules per square inch) is measured. For the 25-mil film, the sample data result is.x₁ = 1.15 and S₁ = 0.11, while for the 20-mil film, the data yield 2 = 1.06 and s2 = 0.09. Note that an increase in film speed would lower the value of the observation in microjoules per square inch. Do the data support the claim that reducing the film thickness increases the mean speed of the film? Use a = 0.10 and assume that the two population variances are equal and the underlying population of film speed is normally distributed. The appropriate decision for the test is to reject the null hypothesis True FalseFour samples are taken and averaged every hour from a production line and the hourly measurement of a particular impurity is recorded. Approximately one out of six of these averages exceeds 1.5% when the mean value is approximately 1.4%. State assumptions that would enable you to determine the proportion of the individual readings exceeding 1.6%. Make the assumptions and do the calculations.
- Arsenic is a chemical element that occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. The main use of metallic arsenic is for strengthening alloys of copper and lead. Unfortunately, arsenic occurs in some ground water. In large quantities it is toxic for multicellular life. A mean arsenic level of 8 particles per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested regularly for arsenic. A random sample 37 tests gave a sample mean of 7.2 ppb arsenic with standard deviation of 1.9 ppb. Assume that arsenic levels are normally distributed. We are to use the sample data and test if mean arsenic level in the well in question is less than 8 ppb. a. Test statistic isb. The ? − value of the test isc. At the significance level calculated in part c), we conclude that mean arsenic level in thewell isResiduals are the: 1.horizontal deviations from the line of best fit to each data point 2.perpendicular distances from the line of best fit to each data point 3.vertical deviations from the line of best fit to each data point 4.areas of the squares between the line of best fit and each data pointCalcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In 1990, the concentration of calcium in precipitation in a certain area was 0.15 milligrams per liter (mg/L). A random sample of 10 precipitation dates in 2007 results in the following data table. Complete parts (a) through (c) below. Click the icon to view the data table. (a) State the hypotheses for determining if the mean concentration of calcium precipitation has changed since 1990. Но Ho: 0.15 mg/L H1: 0.15 mg/L i Data Table (b) Construct a 95% confidence interval about the sample mean concentration of calcium precipitation. The lower bound is The upper bound is (Round to four decimal places as needed.) 0.237 0.067 0.224 0.126 0.081 0.131 0.075 0.171 0.314 0.091 (c) Does the sample evidence suggest that calcium concentrations have changed since 1990? Print Done A. Yes, because the confidence interval does not contain 0.15 mg/L. B. Yes, because the confidence interval contains…