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Tires and Tread Life: Probability

APSTAT-BJNH7S

A certain type of tire's tread life is approximately normal with a mean of $42,000\text{ miles}$ and standard deviation of $3000\text{ miles}$.

The shaded area in the figure below represents which of the following probabilities?

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A

The probability the tread life of this type of tire is between $36000\text{ miles}$ and $45000\text{ miles}$.

B

The probability the tread life of this type of tire is between $36000\text{ miles}$ and $48000\text{ miles}$.

C

The probability the tread life of this type of tire is between $39000\text{ miles}$ and $45000\text{ miles}$.

D

The probability the tread life of this type of tire is between $39000\text{ miles}$ and $48000\text{ miles}$.

E

The probability the tread life of this type of tire is between $39000\text{ miles}$ and $51000\text{ miles}$.