In how many ways can these students form n groups of three people each if each group is to contain a sophomore, a junior, and a senior?

Right triangle xyz has a right angle at vertex y and a hypotenuse that measures 24 cm. angle zxy measures 70º. what is the length of line segment xy? round to the nearest tenth. 8.2 cm 8.7 cm 22.6 m 25.5 cm

Do you mind if you guys me with this question i’m on number 8

How can you find the mean absolute deviation (mad) for this set of data?