Question

Gillians has 5 tests worth 100 points each. Her scores are 88, 85, 89, 92 and 90. What score does she need on her next test to have an average of 90? Explain. *

Answer 1

96

Explanation:

1) lets take "x" as the 6th test score

so to find average we need to take sum of all numbers divided by number of numbers:

(88+85+89+92+90+x)/6=90

so

88+85+89+92+90=444

(444+x)/6=90

444+x=540

x=96

Gillian needs a 96 on her next test

Answer 2

Explanation:

She needs to 96 on her next test to have an average of 90.

To find the average you add of the numbers and then divide by how many numbers there are. 88+85+89+92+90+96 = 540 and 540/6 = 90