Question

The mean of Fred’s grades on five tests was 75.2. The grades on the first 4 of these tests were 87, 84, 88, and 45. Find the grade on his fifth test.

Answer 1

72

Explanation:

mean x number of total test scores -> 75.2 x 5=376

sum of the four test scores given -> 304

difference of the two numbers -> 376- 304= 72

the missing test score, therefore the answer is 72.

Answer 2

88+87+84+45 = 304
304+x/5=75.2