A random sample of 20 maximum sentences for murder yielded the data, in months, presented to the right. Use the technology of your choice to complete parts (a) through (d) below. 259 342 309 294 273 266 333 288 292 265 261 306 375 294 278 266 255 298 272 297 C..... a. Find a 95% confidence interval for the mean maximum sentence of all murders. Assume a population standard deviation of 35 months. The confidence interval is from months to months. (Type integers or decimals rounded to one decimal place as needed.)

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