Question

Suppose your grades on four science exams are 99, 86, 76, and 95. What grade do you need on your next exam to have a 91 average on the five exams?

A.
89.4


B.
93


C.
90


D.
99

Answer 1

Answer:Correct is 99

Explanation:

Answer 2

Option D.
`99`

Explanation:

Let

x------> the grade in the fifth exam

we know that

`91=(99+86+76+95+x)/5`

solve for x

`91*5=(356+x)`

`455=(356+x)`

`x=455-356=99`