On a given day, the price of a gallon of milk had a mean price of 2.16 with a standard deviation
of 0.07. A particular food store sold milk for 2.09 /gallon. Interpret the z-score for this gas
station.
A) The milk price of this food store falls 7 standard deviations below the mean milk price of
all food stores.
B) The milk price of this food store falls 7 standard deviations above the mean milk price of
all food stores.
C) The milk price of this food store falls 1 standard deviation above the mean milk price of
all food stores.
D) The milk price of this food store falls 1 standard deviation below the milk gas price of all
food stores.
Question 2
A recent survey found that 61 of all adults over 50 wear glasses for driving. In a random
sample of 70 adults over 50, what is the mean and standard deviation of the number who wear
glasses? Round to the nearest hundredth when necessary.
A) mean: 42.7; standard deviation: 6.53 B) mean: 27.3 ; standard deviation: 4.08
C) mean: 27.3 ; standard deviation: 6.53 D) mean: 42.7; standard deviation: 4.08
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