since X N(89 , 152)
X N(89 , 225)
n = 25
Since population standard deviation is known then by central limit theorm sample mean will follow normal distribution with mean and variance
N( , )
N(89 , 225/25)
N(89 , 9)
Sampling distribution is normally distributed by central limit theorem
If a population is known to be normally distributed with size 25 selected from the population?...
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