Suppose commute times in a large city are normally distributed and that 62.50% of commuters in this city take more than 21 minutes to commute one-way. if the standard deviation of such commutes is 6.2 minutes, what is the mean commute?
Accepted Solution
A:
if 62.5% take more than 21 minutes 37.5% take less than 21 minutes
convert .375 to a zscore using the normal distribution chart in your book