A Recent Survey Found That 70% of All Adults Over

Multiple Choice

A recent survey found that 70% 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: 21; standard deviation: 3.83
B) mean: 49; standard deviation: 3.83
C) mean: 49; standard deviation: 7
D) mean: 21; standard deviation: 7