Question

a student of score following marks in test 87, 76, 95 and 88 want a mean of 85 or a better overall for getting the merit certificate what are the minimum marks should get in the last test in order to achieve that average?

Answer 1

Let the minimum marks he should get be x
(87+76+95+88+x)/5 is greater than 85
346+x is greater than 425
X is greater than 79

Answer 2

Answer:

students score in four tests=87,76,95,88

let the score of last test be x

required mean=85

mean=sum of all observations

_____________

no. of observations

85=87+76+95+88+x

_______________

5

85/1=346+x

_____

5

346+x=(85×5)=425

x=425-346

x=79