Mathematics, 10.06.2021 17:40 blaze9691
The duration of routine operations in a certain hospital has approximately a normal distribution with an
average of 120 minutes and a standard deviation of 18 minutes. What percentage of operations last longer
than 138 minutes?
Answers: 1
= 120 minutes and 
18 minutes. 
![=P(\dfrac{X-\mu}{\sigma}\dfrac{138-120}{18})\\\\=P(Z1)\ \ \ [Z=\dfrac{X-\mu}{\sigma}]\\\\=1-P(Z](/tpl/images/1370/0703/777cc.png)
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The duration of routine operations in a certain hospital has approximately a normal distribution wit...
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