Question

If there are 21 values in a data set in order from smallest to largest, what is the first quartile of the data set?

A. The mean of the 3rd and 4th values
B. The mean of the 4th and 5th values
C. The mean of the 5th and 6th values
D. The mean of the 6th and 7th values

Answer 1

@mathmale @wio

Answer 2

@heacain

Answer 3

hello

Answer 4

A?

Answer 5

Well, I would try \(21/4\).

Answer 6

5.25

Answer 7

That gives you \(5.25\), which leads me to think it is between \(5\) and \(6\).

Answer 8

ohhh

Answer 9

thanks man u smart

Answer 10

but where did the 4 come from?

Answer 11

because i have another problem very similar and still dont know how to do it

Answer 12

There are 4 quartiles

Answer 13

If there are 21 values in a data set in order from smallest to largest, what is the third quartile of the data set?

A. The mean of the 17th and 18th values
B. The mean of the 18th and 19th values
C. The mean of the 16th and 17th values
D. The mean of the 19th and 20th values

Answer 14

so i do 3 this time?

Answer 15

because they wanna know the third quaritle?

Answer 16

For third quartile, you would use \(\frac 34\)

Answer 17

First quartile is \(\frac 14\) and second quartile is \(\frac 12\)

Answer 18

21/34?

Answer 19

i dont understand im sorry

Answer 20

Okay, do you understand how to find the median?

Answer 21

Im late! :(

Answer 22

smallest to largest the middle number?

Answer 23

Right

Answer 24

Now when you split things in half, the first quartile is the median of the first half.

Answer 25

If there are 21 numbers, then the media is at 11. 1-10 is ten numbers, 12-21 is ten numbers.

Answer 26

im following

Answer 27

First quartile is the median of 1-10 numbers.

Answer 28

second is the 12-21

Answer 29

1-5 is five numbers, 6-10 is five numbers. This means the median is the median of 5 and 6.

Answer 30

We also split 12-21 the same way. We have 12-16 is five number, and 17-21 is five numbers.

Answer 31

im lost now

Answer 32

```
12 13 14 15 16 17 18 19 20 21
1 2 3 4 5 5 4 3 2 1
```

Answer 33

ok ok

Answer 34

so it would be C?

Answer 35

Yes

Answer 36

how do i find the third quaritle

Answer 37

median of later half of the list