A dentist gives each patient a toothbrush after his or her visit. The toothbrushes come in 5 different colors, and they are chosen at random to give to the patients. The chart shows the number of each color toothbrush given to the last 50 patients to visit the dentist's office

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%