Margie takes a random sample of 30 students in her seventh-grade class and finds that 75% of the sample prefers the color blue o
ver the color red. There are 125 students in the seventh grade. Based on the sample proportion, about how many students in the seventh grade would be expected to prefer blue over red? 30
75
94
125
First you turn 75% into a decimal (.75. Then you multiply that by 125 to get about 94. The answer would be 94. To check this you can turn it into a fraction 94/125 then turn it into a fraction which would be 75%
Because CD corresponds to BC, the scale factor from triangle ABC to triangle CDE, is 7/8. Now, DE corresponds to AB, so to get DE, we must multiply the value of AB by 7/8. 6 times 7/8 is 5.25, and rounding to the nearest tenth of a foot, the value of DE is 5.3.
