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The Canadian Automobile Association (CAA) reports that the average time it takes to respond to an...

The Canadian Automobile Association (CAA) reports that the average time it takes to respond to an emergency call is 25 minutes. Assume the response times are normally distributed with a standard deviation of 3.5 minutes.

Find the percentage of CAA emergency calls that take more than 30 minutes to respond to.

Math   Statistics-And-Probability   
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Answer #1

X : average time taken to respond to an emergency call

X ~ N (25,3.5)

the percentage of CAA emergency calls that take more than 30 minutes to respond to is :-

[ in any blank cell of excel type =NORMSDIST(1.4286) ]

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