Question

Agnes scored 82 on her first test, 69 on her second test, and 84 on her third test. Suppose Agnes has one more test in the semester and what’s to finish with a mean im score of 80

What score does she need on her last test to finish with a mean score of 80?

Answer 1

Agnes would need to score a 85 to get an average of 80.

Explanation:

`(82+69+84+x)/(4)` = 80 multiply both sides by 4

82+69+84+X = 320

235+X = 320 subtract both sides by235

x = 85