Question

ASAP!!!!!!!!!!

A student took 5 test in a quarter 3. His average was a 88. Four of his test scores were 87, 94, 86, and 100. What was his last test score? ( statistics) ( please write down or type it out! ) ty

Answer 1

Answer: 73

Explanation: 87+94+86+100+73=440/5=88

Answer 2

The last test score should be 73

Explanation:

`88 = (( 87 + 94 + 86 + 100 + X ))/(5)`

Add all the values in the parentheses together to get:

`88 = (367 + X)/(5)`

You want to remove the 5 next, so you multiply both sides by 5.

`5 * 88 = (367 + x)/(5) *5`

`88 * 5 = 440`

You should get:

`440 = 367 + x`

The last step is to subtract both sides by 367:

`440 - 367 = 73`

`X = 73`

I hope this helps!