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?
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Answers
Answered by
2
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
Answered by
5
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
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