Chapter 5, Problem 17P

1. For each of the following, identify the exam score that should lead to the better grade. In each case, explain your answer.

A score of $X=70$, on an exam with $M=82$and $\sigma =8$; or a score of $X=60$on an exam with $\mu =72$and $\sigma =12$.

A score of $X=58$, on an exam with $\mu =49$and $\sigma =6$; or a score of $X=85$on an exam with $\mu =70$and $\sigma =10$.

A score of $X=32$, on an exam with $\mu =24$and $\sigma =4$; or a score of $X=26$on an exam with $\mu =20$and $\sigma =2$.