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CAHSEE Math 2.1 Statistics, Data, and Probability II 178 Views
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Description:
Statistics, Data, and Probability II Drill 2 Problem 1. Yogi's rate of success increased the most from when to when?
Transcript
- 00:03
This question is shmoopier than the average bear…
- 00:08
Yogi Bear has been tracking his picnic basket-stealing rate of success
- 00:11
for each of the first six months of the year.
- 00:14
The following graph shows how Yogi fared in each of those months.
- 00:18
Yogi’s rate of success increased the most from… when to when?
Full Transcript
- 00:23
And here are the potential answers…
- 00:27
Ok so this question is asking about relative growth rates and it is asking us to calculate
- 00:32
from one period to the next.
- 00:34
Note that the answer set doesn’t even include the first period so we can ignore it.
- 00:39
Best way to start is to just make a quick table.
- 00:43
Sit at it, take out our notebook and pen.
- 00:46
And then make this kind of table:
- 00:48
Second: 65
- 00:50
Third: 70
- 00:51
Fourth: 80
- 00:52
Fifth: 50
- 00:53
Sixth: 70 Well just visually we can tell that the steepest
- 00:57
increase is from 5 to 6 but to be hugely sure we’re right…
- 01:02
…we can just apply the formula NEW MINUS OLD OVER OLD to each of the choices.
- 01:08
For A, it looks like this: 70 – 65 over 65 and the growth rate is 5 over 65 or just 7.7%.
- 01:19
For B, we grow from 70 to 80 or 10 units and
- 01:22
get 10 over 70 or a rate of 14.3%.
- 01:28
For answer choice C, we grow from 4 to 5 which
- 01:31
is actually SHRINKAGE so we can just toss it – no growth.
- 01:35
Answer D goes from 50 to 70 or a growth amount of 20 – 20 over 50 is 40 per cent which
- 01:41
just smokes everything else.
- 01:45
So the answer is D.
- 01:46
As in… “Darn that Ranger Smith…”
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