Engines, again Horsepower is another measure commonly used to describe auto engines. Here are the summary statistics and histogram displaying horsepowers of the same group of 38 cars discussed...

Engines, again Horsepower is another measure commonly used to describe auto engines. Here are the summary statistics and histogram displaying horsepowers of the same group of 38 cars discussed in Exercise 31.

e) From the histogram, make a rough estimate of the percentage of these engines whose horsepower is within one standard deviation of the mean.

 f) A fuel additive boasts in its advertising that it can “add 10 horsepower to any car.” Assuming that is true, what would happen to each of these summary statistics if this additive were used in all the cars?