The mean of the data set is 10. what is the 5th number in the data set? 12,9,8,13,?

Manny bought 12 pounds of vegetables at the supermarket. 75% of the vegetables were on sale. how many pounds of vegetables were not on sale? 98 points : )

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)