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ACT Math 6.2 Pre-Algebra

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

ACT Math	Pre-Algebra
ACT Mathematics	Pre-Algebra
Foreign Language	Arabic Subtitled Chinese Subtitled Korean Subtitled Spanish Subtitled
Language	English Language
Pre-Algebra	Simple descriptive statistics (mean, median, mode, range) Understanding simple descriptive statistics
Product Type	ACT Math
Statistics	Mean, Median, and Mode

Transcript

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."