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

Answer:

D. 95

Step-by-step 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

$80+100+85+85=350\\\frac{350}{4} =87.5$

B.) 90

$80+100+85+90=355\\\frac{355}{4}= 88.75$

C.) 92

$80+100+85+92=357\\\frac{357}{4} =89.25$

D.) 95

$80+100+85+95=360\\\frac{360}{4} =90$

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