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The mean gas mileage for a hybrid car is 56miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation

The mean gas mileage for a hybrid car is 56miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.2miles per gallon.

(a) What proportion of hybrids gets over 61miles per gallon?

(b) What proportion of hybrids gets 51miles per gallon or less?

(c)Whatproportion of hybrids gets between 58and 61miles per gallon?

(d) What is the probability that a randomly selected hybrid gets less than 45miles per gallon?

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