Question

After five science tests, Sonya's average score

is 89. If she gets a 95 on the sixth test, what is

her new average?

A. 89.50

B. 89.90

C. 90.00

D. 90.50

Answer 1

C. 90.00

Explanation:

We find average by adding up all values in a data set and dividing by the total number of values we have

We can say that Sonya got 89 for each test (it doesn't matter what each test score exactly was--you'll see why in a second)

So, we can add up 89 five times (5 tests have occured)

*I say add up, because that's what average is, but you can find this number by multiplying 89 · 5

89 · 5 = 445

(89 + 89 + 89 + 89 + 89 = 445)

Now, we need to add up our new value: 95

445 + 95 = 540

So, we can now divide 540 (sum of all values) by 6 (total number of values)

540 ÷ 6 = 90

So, C (90.00) is her new average

hope this helps! have a lovely day :)

Answer 2

C

Explanation:

The sum of Sonya's 5 initial tests = 89*5 = 445.

445 + 95 = 540 (sum of the 6 tests)

Average = 540/6 = 90

Hence C