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Burka [1]
3 years ago
9

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
Mathematics
1 answer:
Mandarinka [93]3 years ago
7 0

Mean = np = 60(0.7) = 42

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

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