Angel and trevor were working on a math problem. it was asking what the "greatest common factor" of 30 and 18. they decided that they would write out the factors for each, then look for the largest number they have in common. so, them out and show how they could find the answer.

The stem-and-leaf plot shows the heights in centimeters of teddy bear sunflowers grown in two different types of soil. soil a soil b 5 9 5 2 1 1 6 3 9 5 1 0 7 0 2 3 6 7 8 2 1 8 3 0 9 key: 9|6 means 69 key: 5|8 means 58 calculate the mean of each data set. calculate the mean absolute deviation (mad) of each data set. which set is more variable? how do you know?