The general manager of an assembly line at Ford wants to get a sense of the consistency of the mileage of a series of pickup trucks. Fifty trucks are randomly selected from the line and driven around for a few weeks and their miles per gallon was calculated. The results were approximately normally distributed N(23.8, 3.4), i.e., mean of 23.8 and SD of 3.4.

Note: For this problem, you don't need to come up with accurate answers, but you do need to be in the vague ballpark. For example, if some observation has a value below the mean, do not report a quantity of greater than 50%. Also, if for any of your answers you expect the result to be "very very low" or "very very high", you can simply say so. That is, do not feel the need to specify a number.

1. About what percentage of trucks will have an MPG of 24.1 or lower?

About what percentage of trucks will have an MPG of 20 or higher?

About what percentage of trucks will have an MPG of 33 or higher?

About what percentage of trucks will have an MPG of 12 or fewer?