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The length of a city’s bus routes are normally distributed with a mean of 14.5 mi and a standard deviation of 3.2 mi.
(a) What percentage of city bus routes are less than 15 mi?
(b) What percentage of city bus routes are greater than 20 mi?
(c) What percentage of city bus routes are less than 10 mi?

Respuesta :

a) What percentage of city bus routes are less than 15 mi? 
56.20820167 ≈ 56.2%

b)What percentage of city bus routes are greater than 20 mi? 
4.282995170  ≈ 4.3 %

c) What percentage of city bus routes are less than 10 mi?
7.98 ≈ 7.98 %

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