George found that he blinked 85 times in 15 minutes. How many times would you expect George to blink in 105 minutes?

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

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%

Is it greater than or less than7*3_9*2