Test scores are normally distributed with a mean of 100 and a standard deviation of 15. An individual score is found to be 90. Find the Z-score corresponding to this value.
A. -0.67
B. 0.67
C.1.33
D.-1.33

Suppose that prices of a gallon of milk at various stores in one town have a mean of $3.71 with a standard deviation of $0.10. using chebyshev's theorem, what is the minimum percentage of stores that sell a gallon of milk for between $3.41 and $4.01? round your answer to one decimal place.