Question

Cindy has test scores of 72,80,85,82,77. What does Cindy need to score on her last test for her average grade to be between a 80 and 82?

Answer 1

82

____

72,80,85,82,77.=396(5 tests)

82*6 = 492 (6 tests)

492-396=96.

If I am supposed to use 82 as the mean or main mark then I'll get 96 for her average grade to be between 80 and 82.

Use this same procedure if you have any mean score in mind ✍️✍️✍️✍️

Answer 2

70 ≥ (73 + 83 + 85 + 90 + 2x) / 6 ≥ 79

70 ≥ (331 + 2x) / 6 ≥ 79