Distribution 6282

The waiting time in the buffet is governed by the normal distribution with a mean value of 130 seconds and a variance of 400. What is the probability that someone will wait less than a minute and a half?

Correct answer:

p =  2.28 %

Step-by-step explanation:

s=130 s r=400 s s2=r=400=20 s  t=1.5 60=90 s  p=100 0.0228=2.28%

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