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Mathematics, 11.02.2021 20:50, Uc34758
A certain cell phone advertises a mean battery life of 32 hours. Suppose the battery life of these phones follows a Normal distribution with standard deviation 2.5 hours. If 5 of these phones are randomly selected from the factory, then there is about a 95% probability that the sample mean will fall in which interval?
Find the z-table here.
7.5β56.5 hours
21.0β43.0 hours
27.1β36.9 hours
29.8β34.2 hours
31.0β33.0 hours
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Answers: 3
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A certain cell phone advertises a mean battery life of 32 hours. Suppose the battery life of these p...
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