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CAHSEE Math 4.2 Mathematical Reasoning 182 Views


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Description:

Mathematical Reasoning Drill 4, Problem 2. How many people failed to return the survey?

Language:
English Language

Transcript

00:03

Here’s your shmoop du jour...

00:05

A survey was taken of 1,000 randoms to determine people's favorite way of paying for Band-Aids.

00:11

The following graph shows the results from the surveys that were returned. 

00:15

How many people failed to return the survey?

00:18

Possibly because they were being held at gunpoint by the Band-Aid Bandits?

00:22

And here are the potential answers…

00:26

1000 people in total were given a survey, and all of the responses are shown in the pie chart.

00:32

That means that people who didn’t respond aren’t shown.

00:35

Since we know the numbers of everyone who did respond…

00:37

…if we add those numbers up we can find the total number of respondents.

00:41

Then, we can use that to find the total number of people who didn’t return the survey.

00:46

Let’s get started on the first step, finding the total number of people who successfully

00:50

returned the survey. Thank you very much.

00:52

We can do this by summing the numbers in each section of the pie chart.

00:56

This comes out to 190 + 170 + 140 + 80 + 60, which is 640.

01:02

If there were six hundred forty people who did respond, that means the rest of the thousand

01:08

failed to respond. So, we can just subtract 640 from 1,000 to get 360.

01:14

The answer is (B).

01:15

As in… “Band-Aid Bandits.”

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