Question

Heather received grades of 80, 75, and 86 on 3

Answer 1

Answer:

87

Step-by-step explanation:

We know Heather recieved grades of 80, 75 and 86.

Let's find her average on those 3 tests.

80 + 75 + 86 = 241   Since there are 3 tests we divide by 3.

241/3 = 80.3333   Is her aveerage on the first 3 tests.

She need to average 82 so we can write an equation with t being the score on her 4th test.

$\frac{80 + 75 + 86 + t}{4} = 82$

$\frac{241 + t}{4} = 82$         Multiply each side by 4

($\frac{241+t}{4}$) * 4 = 82 * 4         4 on the left will cancel

241 + t = 328     Subtract 241 from each side

241 - 241 + t = 328 - 241

t = 328 - 241

t = 87

Heather must get an 87 to have an average score of 82.