Here we have given that,
a data point(grade)=81
mean =E(x)= 75
and standard deviation(SD) = 12
we know that,
Z statistic is,
Z=(X-E(X))/SD
therefore,
Z=(81-75)/12
=6/12
Z=0.5
a grade of 81 in test in which the mean is 75 and standard deviation is...
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