During his high school football career a running back averaged 81 yards/game with a standard deviation of 22 yards/game. The distribution of his yards was approximately Normal.
What percent of his performances would you expect to be between 81 and 147 yards?

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

x = 23.78

step-by-step explanation:

i think it might be a but you might want a second opinion