Suppose the heights of the members of a population follow a normal distribution. if the mean height of the population is 68 inches and the standard deviation is 4 inches, 99.7% of the population will have a height
within which of the following ranges?

a. 56 inches to 80 inches
b. 64 inches to 72 inches
c. 60 inches to 76 inches
d. 52 inches to 84 inches

On a piece of paper graph f(x)=5•(0.4)^x

The ratio of men to women working for a company is 4 to 5 . if there are 90 women working for the company, what is the total number of employees?

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?