Mathematics, 16.08.2020 01:01 hhh4775
The long-distance calls made by the employees of a company are normally distributed with a mean of 6.3 minutes and a standard deviation of 2.2 minutes. Find the probability that a call a. lasts between 5 and 10 minutes. b. lasts more than 7 minutes. c. lasts less than 4 minutes.
Answers: 2
minutes
minutes
![P(X7)=P(\dfrac{X-\mu}{\sigma}\dfrac{7-6.3}{2.2})\\\\=P(Z0.318)\ \ \ \ [z=\dfrac{X-\mu}{\sigma}]\\\\=1-P(Z](/tpl/images/0722/8607/4ea5d.png)
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