The average life of a smartphone is 7 years with a standard deviation of 1 year. Assuming that the lives of these phones follow approximately a normal distribution, using a random sample of n = 9 find the probability that the mean life of such smartphones fall between 6.4 and 7.2 years. A. 69.47% B. 28.60% C. 42.42% D. 30.50%

The average life of a smartphone is 7 years with a standard deviation of 1 year. Assuming that the lives of these phones follow approximately a normal distribution, using a random sample of n = 9 find the probability that the mean life of such smartphones fall between 6.4 and 7.2 years. A. 69.47% B. 28.60% C. 42.42% D. 30.50%

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.

Chapter13: Probability And Calculus

Section13.CR: Chapter 13 Review

Problem 9CR

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Question

100%

A. 69.47%

B. 28.60%

C. 42.42%

D. 30.50%

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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