SOLUTION: The time spent by American adults using their cell phones or computers per day averages 11 hours with a standard deviation of 1.5 hours. The probability that a random sample of 9 A

Question 929504: The time spent by American adults using their cell phones or computers per day averages 11 hours with a standard deviation of 1.5 hours. The probability that a random sample of 9 American adults averages more than 12 hours is approximately

A 0.9772

B 0.0228

C 0.67

D 0.2514

E 0.7486

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

= 2
P(z > 2) = normalcdf(2,100) = .0228
B.
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