A salesman who uses his car extensively finds that his gasoline bills average $125.32 per month with a standard deviation of $49.51 . The probability that his bill will be less than $50 a month or more than $150 for a single month is:
a. 0.4357.
b. 0.1915.
c. 0.6272.
d. 0.3728.
e. 0.6915.
D
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