Question

What is the value of the first quartile (Q1) of the data set?
The graph is in the comments below.

Answer 1

Here is the link to the graph.
http://static.k12.com/calms_media/media/1546500_1547000/1546631/2/9591af661b3319a65e652bbe811c1ccc39f84dbd/MS_IMA_10_10_lesson_manuscript_UNIT_CHECKPOINT_Art_06.jpg

Answer 2

@Agl202

Answer 3

First you have to find Q2, which is the median of the data set. Can you do that?

Answer 4

I need help understanding it.

Answer 5

Do you understand how to read that stem and leaf plot in the link?

Answer 6

The line represents the stem and the numbers represent the leaves.
Right @jwhite12 ?

Answer 7

The numbers in the left column represent the tens, and the numbers on the right side are the ones digits. So the first couple of numbers in your data set are: 45, 51, 52, 58, ...

Answer 8

@Bigballer21 @matlee
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Answer 9

I still don't get it. @jwhite12

Answer 10

Can you write out all the numbers from your data set?

Answer 11

I think the answer is 45. That's the first set of numbers.@jwhite12

Answer 12

45 is the first number in the set, but it's not the first quartile.

Answer 13

I'm confused.@jwhite12

Answer 14

The first thing you need to do is read the stem/leaf plot and write out the list of numbers it represents. I started this list for you earlier. 45, 51, 52, 58...
Can you finish that list?

Answer 15

Is it 3? @jwhite12

Answer 16

So no?

Answer 17

not 3

Answer 18

So your list of numbers is:
45, 51, 52, 58, 61, 63, 66, 72, 74

Answer 19

Before finding Q1, you have to find Q2 -- which is the MIDDLE number of the data set. Can you find Q2?

Answer 20

So the answer would be 61? @jwhite12

Answer 21

Yes, Q2 is 61.
Now to find Q1, we just look at the numbers to the left of Q2.
So we're looking at: 45, 51, 52, 58

Answer 22

To find Q1, you do what we did a minute ago but now we're finding the median of that smaller set.