Using the given table, give the percentage associated with each unit of standard deviation in the standard normal curve to the nearest hundredth. ( explain your answer! ) standard deviation | percentage area -1 to 0 % 0 to +1 % 0 to +2 % 0 to +3 % -1 to +2 %

A) 0.3413 . . . . the area from -1 to 0 is the same as the area from 0 to 1. The normal curve is symmetrical about x=0.

b) 0.3413 . . . . A(1) on the chart

c) 0.4772 . . . . A(2) on the chart

d) 0.4987 . . . . A(3) on the chart

e) 0.3413 + 0.4772 = 0.8185 . . . . A(1)+A(2) on the chart

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.