Question: Can someone breakdown how the bold answer is correct below? In a large population of college-educated adults, the mean IQ is 118 with standard deviation

Can someone breakdown how the bold answer is correct below?

In a large population of college-educated adults, the mean IQ is 118 with standard deviation 20.Suppose 200 adults from this population are randomly selected for a market research campaign.The distribution of the sample mean IQ is approximately Normal with mean 118 and standard deviation 1.414.

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