The numbers of hours worked (per week) by 420 statistics students are shown below.Number of Hours Frequency0 ≤ x < 10 10 10 ≤ x < 20 100 20 ≤ x < 30 220 30 ≤ x < 40 90 The midpoint of the last class is _____. a. 34 b. 35 c. 50 d. 34.5 2) The numbers of hours worked (per week) by 410 statistics students are shown below.Number of Hours Frequency0 ≤ x < 5 20 5 ≤ x < 10 100 10 ≤ x < 15 180 15 ≤ x < 20 110 The number of students working less than 10 hours is _____. a. 120 b. 100 c. 290 d. 310

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Answered: 0 ≤ x < 10 10 10 ≤ x < 20 100…

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter7: Integration

Section7.3: Area And The Definite Integral

Problem 41E: Running In 1987, Canadian Ben Johnson set a world record in the 100-m sprint.The record was later...

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Running In 1987, Canadian Ben Johnson set a world record in the 100-m sprint.The record was later taken away when he was found to have used an anabolic steroid to enhance his performance. His speed at various times in the race is given in the following table . Source: Information Graphics. Timesec Speedmph 0 0 1.84 12.9 3.80 23.8 6.38 26.3 7.23 26.3 8.96 26.0 9.83 25.7 a. Use the information in the table and left endpoints to estimate the distance that Johnson ran in miles. You will first need to calculate t for each interval. At the end, you will need to divide by 3600 the number of seconds in an hour, since the speed is in miles per hour. b. Repeat part a, using right endpoints. c. Wait a minute, we know that the distance Johnson ran is 100m. Divide this by 1609, the number of meters in a mile, to find how far Johnson ran in miles. Is your answer from part a or part b closer to the true answer? Briefly explain why you think this answer should be more accurate. d.
OTHER APPLICATIONS Car Accidents The tables in the next columns give the death rates, per million person trips, for male and female drivers for various ages and number of passengers. Male Drivers Number of Passengers Age 0 1 2 3 16 2.61 4.39 6.29 9.08 17 1.63 2.77 4.61 6.92 30-59 0.92 0.75 0.62 0.54 Female Drivers Number of Passengers Age 0 1 2 3 16 1.38 1.72 1.94 3.31 17 1.26 1.48 2.82 2.28 30-59 0.41 0.33 0.27 0.40 a. Write a matrix for death rate of male drivers. b. Write a matrix for death rate of female drivers. c. Use the matrices from parts a and b to write a matrix showing the difference between the death rates of males and females. d. Analyze the results of part c and make some suggestions on how to reduce the rates.

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Number of Hours	Frequency
0 ≤ x < 10		10
10 ≤ x < 20		100
20 ≤ x < 30		220
30 ≤ x < 40		90

Number of Hours	Frequency
0 ≤ x < 5		20
5 ≤ x < 10		100
10 ≤ x < 15		180
15 ≤ x < 20		110