Question

Reasoning: Krishan wants his quiz average to be at least 90 so that he can get an A in the class. His current quiz scores are: 80, 100, 85. What does he have to get on his next quiz to have an average of 90?

A. 85
B. 90
C. 92
D. 95

Answer 1

D. 95

Explanation:

The average is also known as the mean. To find the mean, you need to add all the values, then divide them by the number of terms:

1 2 3

1+2+3

6/3=2

The mean for the example would be 2. Now, using your values, you can use the options to see which one gives you an average of 90:

A.) 85

`80+100+85+85=350\\(350)/(4) =87.5`

B.) 90

`80+100+85+90=355\\(355)/(4)= 88.75`

C.) 92

`80+100+85+92=357\\(357)/(4) =89.25`

D.) 95

`80+100+85+95=360\\(360)/(4) =90`

The next score on the quiz needs to be 90 for the mean to be 90.