Donna has 8 cds that she is going to give away. she lets her best friend choose 2 of the 8 cds. how many different groups of 2 cds are possible?

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%

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Write the percent as a fraction or mixed number in simplest form. 0.8%