Mathematics, 10.05.2021 18:10 slugmilk1090

The duration of routine operations at Charlotte General has approximately a normal distribution with an average of 125 minutes and a standard deviation of 18 minutes. a. What proportion of operations last at least 120 minutes?
b. What proportion of operations lasted between 90 and 130 minutes?
c. What proportion of operations lasted less than 122 minutes?

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