SOLUTION: An average score of 90 or above in an English course receives an A grade. A student has grades of 85, 86, 90, 98 on four tests. Find the range of scores on the fifth test that will
Algebra ->
Inequalities
-> SOLUTION: An average score of 90 or above in an English course receives an A grade. A student has grades of 85, 86, 90, 98 on four tests. Find the range of scores on the fifth test that will
Log On
Question 1046534: An average score of 90 or above in an English course receives an A grade. A student has grades of 85, 86, 90, 98 on four tests. Find the range of scores on the fifth test that will give the student an A grade. (Let the maximum score on each test be 100. Enter your answer using interval notation.) Answer by solver91311(24713) (Show Source):
The average of 5 numbers is the sum of the 5 numbers divided by 5. So the total of the 5 numbers must be 5 times the average. Add the given scores, then subtract that total from the product 5 times 90 to get the minimum score that will give an A grade. The upper end of the range is given as 100.
John
My calculator said it, I believe it, that settles it
