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This video covers how to set up a stem and leaf plot and use it to find the mean and median of a set of numbers.
CAHSEE Math 2.3 Statistics, Data, and Probability I 183 Views
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Description:
Statistics, Data, and Probability I: Drill Set 2, Problem 3. Which of the following statements is true?
Transcript
- 00:03
Here's a boring, unshmoopy question you'll find on an exam somewhere in your life...
- 00:08
The following chart shows Dave's weight loss progress.
- 00:11
Which of the following statements is true?
- 00:14
And here are your answer choices:
- 00:21
Well, it's really asking whether or not we can read a bar chart.
Full Transcript
- 00:25
Uh, no... this kind of bar chart.
- 00:27
There's no formula for answering this question -- you have to brute force it.
- 00:33
So question A -- did Dave stop losing weight after month 5?
- 00:37
Well, with one look, we can see here that he flatlines at 160 pounds.
- 00:41
So we can check A off our list -- it can't be true.
- 00:44
We're down to 3 possible answers. Now let's try B.
- 00:48
He lost the most weight between the first two months.
- 00:51
Well, here they are -- month 1 and 2... ...and yep.
- 00:53
Looks like the start of his diet went pretty darn well.
- 00:56
But you can only avoid cupcakes for so long.
- 01:02
Statement (B) is also false.
- 01:03
He lost the most weight between the first two months,
- 01:07
not the fourth and fifth. D is a no-go either.
- 01:10
At the end of nine months,
- 01:11
Dave had lost a total of 40 pounds... ...not the 50 claimed by statement D.
- 01:16
Only statement C is true. Between months 1 and 3, he lost about 25 pounds.
- 01:21
Way to go, Dave. You can almost fit into those pants you wore in college.
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