Question

17. Alisha got an average of 62 in 5 tests. What does she need to score on the next test to get her average up
to 652
18 State​

Answer 1

Answer:

A student's average arithmetic mean test score on 4 tests

A student's average (arithmetic mean) test score on 4 tests is 78. What must be the student's score on a 5th test for the student's average score on the 5 tests to be 80? Since the student's average test score on 4 tests is 78, then the sum of the first 4 test scores is 4*78=312.

Answer 2

Answer:

80

(B) 82

(C) 84

(D) 86

(E) 88

Since the student's average test score on 4 tests is 78, then the sum of the first 4 test scores is 4*78=312. We need the sum of ALL 5 scores to be 5*80=400, so if is the 5th test score, then --> 312 + x = 400

X = 88

I hope it helps you