A professor at a local university noted that the exam grades of her students were normally distributed with a mean of 73 and a standard deviation of 11 . If 69.5 percent of the students received grades of C or better, what is the minimum score of those who received C's?
a. 70.39
b. 67.39
c. 50.39
d. 65.39
Question 2
The interval estimate of the mean value of y for a given value of x is the
a. prediction interval estimate.
b. confidence interval estimate.
c. average regression interval.
d. x versus y correlation interval.
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