Question

Amy’s current grades for her assignments in math class are 85, 90, 95, and 80. What grade does she have to earn on her next assignment to attain an average of 90?

I will mark you as Brainliest

Answer 1

Answer:

10 marks

Step-by-step explanation:

average = sum of numbers/ total numbers

average required = 90

so

90 = 80 + 85 + 90 + 95 + x / 5

90 × 5 = 350 + x

450 - 350 = x

x = 10

she needs 10 marks to get average of 90

Answer 2

Answer:

100

Step-by-step explanation:

average = sum of observations/ no. of observations.

So,

90 = 85 + 90 + 95+80+X/5

90 = 350+X/5

450 = 350 + X

100 = X