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%
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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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
A. 69.47%
B. 28.60%
C. 42.42%
D. 30.50%
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