76, 91, 60, and 77 as your grades you are hoping to earn a C this will occur if the avg is greater than or = to 70 or 80. what range of grades on the fifth exam will result in earning a C

Question

76, 91, 60, and 77 as your grades you are hoping to earn a C this will occur if the avg> is greater than or = to 70 or 80. what range of grades on the fifth exam will result in earning a C

luffingsails · Answer

(76+91+60+77 + X) / 5 = 70

and

(76+91+60+77+X)/5 = 80

Solve both for X and you have your range of grades.

Though are your sure it includes 80? Not 70-79 for a C?

anonymous · Answer

well 80 would give it a greater range but thank you!

anonymous · Answer

less than 80*

luffingsails · Answer

The other way to set this up is

70 <= (76+91+60+77+X)/5 < 80

Hope that helps.

anonymous · Answer

it did thank you very much!!

luffingsails · Answer

welcome.