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Gelneren [198K]
3 years ago
9

Suppose commute times in a large city are normally distributed and that 62.50% of commuters in this city take more than 21 minut

es to commute one-way. if the standard deviation of such commutes is 6.2 minutes, what is the mean commute?
Mathematics
1 answer:
Serga [27]3 years ago
7 0
If 62.5% take more than 21 minutes 
<span>37.5% take less than 21 minutes </span>

<span>convert .375 to a zscore using the normal distribution chart in your book </span>

<span>P(.375) = z -0.318639364 </span>

<span>(21 - x) / 6.2 = -0.318639364 </span>

<span>(21 - x) = -1.9755640568 </span>

<span>22.9755640568 = x </span>

<span>mean commute is 22.98 minutes</span>
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