Peters Bryant
05/14/2023 · Primary School
3. Random samples of size 225 are drawn from a population with mean 100 and standard deviation 20 . Find the mean and standard deviation of the sample mean. [Ans \( \left.\mu_{\bar{x}}=100 ; \sigma_{\bar{x}}=1.33\right] \)
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متوسط العينة 100، انحراف العينة المعياري 1.33
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