Mathematics, 02.06.2021 02:50 RoyalGurl01
The mean life expectancy of a certain type of light bulb is 945 hours with a standard deviation of 21 hours. What is the approximate standard deviation of the sampling distribution of the mean for all samples with n
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and standard deviation 
, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean 
.
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