Mario earned three times as much money last year as his wife elena. the total amount that the two earned was $11,000. how much money did mario earn?

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.

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

(60 points) explain this in detail