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Ответ:

jadenp23

27.03.2023

Mathematics

Step-by-step explanation:

The sample mean is the best point estimate of the population mean .

Given : A simple random sample of 5 observations from a population containing 400 elements was taken, and the following values were obtained (12 18 19 20 21).

Then , the sample mean = $\dfrac{\text{Sum of observations}}{\text{Number of observations}}$

sample mean $=\dfrac{12 +18 +19+ 20+ 21}{5}=18$

Hence, A point estimate of the mean is 18.

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