The mean gas mileage for a hybrid car is 57 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.5 miles per gallon.? (

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

(b) What proportion of hybrids gets 52 miles per gallon or? less?

(c)What proportion of hybrids gets between 58 and 62 miles per? gallon?

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