A. What proportion of students score less than 75B. If samples of n=4 are selected from the population what proportion will have means less than 75?C. If samples of n=75 are selected from the population what proportion will have means less than 75
z = (75-70)/10 = 0.5
P (z< 0.5)= 0.6915
Z =(75-70)/(10/2) = 1.0 ; Standard error =10/sqrt(4) =5
P(z<1) = 0.8413
z = (75-70)/(10sqrt(75))=5/(1.1547) = 4.33 ; standard error= 10/sqrt(75)
P (z< 4.33) =1.0000
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