IQ scores in a large population have a normal distribution with mean=100 and standard deviation=15. What...

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IQ scores in a large population have a normaldistribution with mean=100 and standard deviation=15. What is theprobability the sample mean for n=2 will be 121 or higher?
(I understand the z score equals 1.98,could you pleaseexplain to me how the final answer is equal to0.0239?thanks.)
Also, why do we use 1 and subtract 0.9761 to get 0.0239? Where does0.9761 come from?

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It appears that you have already done the calculation for the zvalue So I will skip that part I will tell you the scenarios onwhich you should use which table and how to calculate theprobability from z valueIn this case the distribution increases from left to right Thismeans consider a normal distribution chart like the one shownbelow Left hand side of the curve will begin from 0 and willeventually move to the highest level Now keep in mind that thenormal distribution is usually an infinite chart However weusually represent it within 3 standard See Answer

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