Question

after six biology tests, ruben has a mean score of 77. what score does ruben need on the next test to raise his average (mean) to 79?

Explanation:

Step1: Calculate total of 6 tests

$\text{Total}_6 = 6 \times 77 = 462$

Step2: Calculate total needed for 7 tests

$\text{Total}_7 = 7 \times 79 = 553$

Step3: Find required next test score

$\text{Required Score} = 553 - 462$

Answer:

91