Question

the average of five test grades is 84. if four of the test grades are 71,81,94, and 77, what is the other test grade?

Answer 1

84 x 5 = 420 (the sum of the five numbers)

71 + 81 + 94 + 77 = 323

420 - 323 = 97

You can double check your work by finding the average of the 5 numbers: (71+81+94+77+97) / 5 = 84

So, 97 is the missing test grade.