The batteries used by a calculator have useful lives that follow a normal distribution, with a mean of 1000 hours and a standard deviation of 200 hours. A. A random sample of 100 batteries is drawn. Find the range of middle 95% sample means of batteries useful life. B.for a random sample of 100 batteries, find the probability that the sample mean will be 960 or lower.

The batteries used by a calculator have useful lives that follow a normal distribution, with a mean of 1000 hours and a standard deviation of 200 hours. A. A random sample of 100 batteries is drawn. Find the range of middle 95% sample means of batteries useful life. B.for a random sample of 100 batteries, find the probability that the sample mean will be 960 or lower.

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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