suppose 20 out of 140 people said they play tennis and 1 out of every 9 of those players have a tennis coach. Using these same ratios in a group of 504 people, predict how many you would expect to have a tennis coach. explain how you made the prediction.

Suppose there are 10 five and six-year-old attending a birthday party. when a 30 year old mother walks into the room with an infant in her arms, what happens to the mean age in the room? what happens to the standard deviation of ages in the room? a. the mean and standard deviation of both change. b. the meaning will change, but the standard deviation will stay approximately the same. c. i mean will stay approximately the same, but the standard deviation will change. d. the mean and standard deviation will both stay approximately the same.

Which property is illustrated by the following statement? if hxa rgi, then rgi hxa.

What is the solution of the systems of equations? y=2/3x+3 x=-2