Question

After six biology tests, Ruben has a mean score of 76. What score does Ruben need on the next test to raise his average (mean) to 78?

Answer 1

90

Explanation:

since mean = sum of terms / number of terms, we can find the total sum of the tests currently to see how much it needs to be raised

76 * 6 = 456

x = score of the new test

(456 + x)/7 = 78

x =90