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In a large population of college-educated adullts, the IQ is Normally distributed with a mean of...

In a large population of college-educated adullts, the IQ is Normally distributed with a mean of 118 and standard deviation 20. Suppose 100 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, standard deviation 2.
approximately Normal with mean 118 and standard deviation 10.
approximately Normal with mean equal to the observed value of the sample mean and standard deviation 20.
approximately Normal with mean 11.8 and standard deviation 20.
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