Question 57670
The standard deviation of the population is 4.1
but the standard deviation for samples of size
seven of the population is 4.1/sqrt(7)=1.5496
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So Prob(x-bar > 7)=Prob(z > (7-7.1)/1.5496)
=Prob(z> -0.0645)=0.5257...
Cheers,
Stan H.