A recent survey found that 76 % of all adults over 50 wear glasses for driving. in a random sample of 100 adults over 50, what is the mean and standard deviation of those that wear glasses? round the answers to the nearest hundredth.

a. mean: 24.00 ; standard deviation: 4.27

b. mean: 76.00 ; standard deviation: 8.72

c. mean: 24.00 ; standard deviation: 8.72

d. mean: 76.00 ; standard deviation: 4.27

Question

Rene Lloyd

7 April, 11:10

+3

Answers (1)

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Lauryn Hurley · Answer 1

Mean = np = 60 (0.7) = 42

Standard deviation = sqrt (npq) = sqrt (60 (0.7) (0.3)) = 3.55