The batteries from a certain manufacturer have a mean lifetime of 810 hours, with a standard deviation of 70 hours. Assuming that the lifetimes are normally distributed, complete the following statements. (a) Approximately ? 880 hours. of the batteries have lifetimes between 740 hours and (b) Approximately 95% of the batteries have lifetimes between hours and hours.
The batteries from a certain manufacturer have a mean lifetime of 810 hours, with a standard deviation of 70 hours. Assuming that the lifetimes are normally distributed, complete the following statements. (a) Approximately ? 880 hours. of the batteries have lifetimes between 740 hours and (b) Approximately 95% of the batteries have lifetimes between hours and hours.
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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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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Transcribed Image Text:The batteries from a certain manufacturer have a mean lifetime of 810 hours, with a standard deviation of 70 hours. Assuming that the lifetimes are normally
distributed, complete the following statements.
(a) Approximately? e of the batteries have lifetimes between 740 hours and
880 hours.
(b) Approximately 95% of the batteries have lifetimes between hours and
hours.
X
S
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