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Jenny's Overall Mean (Not Like That) 289 Views


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Description:

ACT Math: Pre-Algebra: Drill 6, Problem 2. What score must be earned to bring Jenny's overall mean to at least 87?

Language:
English Language

Transcript

00:03

You look like you could use a shmoopy question...

00:06

On her first four tests, Jenny earned an 85,

00:08

97, 79, and 84. Her uber-strict parents aren't letting her

00:13

attend the State Math Finals unless she brings her overall mean up to at least 87.

00:19

What must Jenny earn on her next test to be allowed to have... every young girl's dream come true?

00:28

And here are the potential answers...

00:33

OK so what is this question asking?

00:36

Well it's really the advanced ninja version of taking averages.

00:40

Poor Jenny took 4 tests and she's going to take another

00:43

-- she will have taken 5 tests in total.

00:46

And the TOTAL of these 5 tests must have an average of 87 -- or in other words, they

00:51

must total to 5 times 87 or have a total of 435.

00:56

So the answer comes from just adding up the previous 4 tests, subtracting that number

01:02

from 435 and whatever is left is what she has to get to average an 87.

01:11

So if we add the previous 4 tests we get a sub-total of 345.

01:14

Subtract 345 from 435 and we get 90.

01:18

So she has to get a 90 or better on the last test.

01:22

Answer D.

01:23

As in, "Deadly weapons."

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