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ACT Mathematics Videos 164 videos
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
ACT Math: Pre-Algebra Drill 1.2. What proportion of Jenna's day is spent Wii-swimming?
ACT Math 1.5 Pre-Algebra 299 Views
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Description:
ACT Math Pre-Algebra Drill 1, Problem 5. Can you find the mean?
Transcript
- 00:03
Time for your daily dose of shmoop... Open wide!
- 00:07
Find the mean of the following numbers: 37,
- 00:09
38, 45, 67, 23, 81. And here are the potential answers...
- 00:18
This... is nice.
- 00:20
This... is mean.
Full Transcript
- 00:23
But we're talking about mean in mathematical terms... here, it's just a fancy word for average.
- 00:27
To calculate averages, we first add the numbers...
- 00:30
...to get a total of 291
- 00:33
Since there were 6 numbers, we divide by 6.
- 00:39
So 6 goes into 29 four times, leaving 5... then 6 goes into 51 eight times, leaving 3...
- 00:48
so we have 48 and 3 sixths... or 48 and a half... or 48.5.
- 00:55
So the answer is B.
- 00:57
As in, "Baby needs another nap."
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