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Times for an ambulance to respond to a medical emergency in a certain town are normally distributed with a mean of 450 seconds and a standard deviation of 50 seconds.

Suppose there are 160 emergencies in that town.

In about how many emergencies are the response times expected between 400 seconds and 500 seconds?



51

55 <my choice

80

109

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3 answers

  1. http://davidmlane.com/hyperstat/z_table.html

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  2. how do I use that ?

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  3. use first choice, area from values

    mean 450
    sd 50

    between 400 and 500

    output is .6827 or 68% are between
    well that is a little less thsan .7*160 = 112
    so
    109

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