Question

can anybody help me please
question is find the first quartile and the third quartile of the data set 55,62,61,54,68,72,59,61,70

Answer 1

[55,62,61,54,68,72,59,61,70]
To find the first quartile, and the third quartile, list from least to greatest.
Would you mind doing that?

Answer 2

its ok ,one min

Answer 3

If you didn't know:
The first quartile represent the 25% of the data set.
The third quartile represent the 75% of the data set.

Answer 4

54,55,61,61,62,68,70,72

Answer 5

Alright. I hope this is correct. Now, what's the median of that data set?

Answer 6

do you add both 61 and 62 to find the median?

Answer 7

Lol, no. You just look for the middle number in the data set.
That's why I put the data set from least to greatest. ;)

Answer 8

Oh wait. It's even, so yes. You add 61 and 62, and divide it by 2. >_>

Answer 9

ok

Answer 10

So what do you get?

Answer 11

61.5

Answer 12

Great!

Answer 13

So we split the data set into 2 data set. Now what's the middle number of each data set?

Answer 14

61.5

Answer 15

We have data set [54, 55, 61, 61]
What's the median in that data set?

Answer 16

58

Answer 17

Alright. What about data set [62, 68, 70, 72]
What is the median?

Answer 18

69

Answer 19

Ooh. Okay.
So 58 represent the first quartile, while 69 represetn the third quartile.
Make sense, right?

Answer 20

yea

Answer 21

We split half the data set, and find the median of the data set to get the 25%, and the 75%.

Answer 22

http://www.mathsisfun.com/data/quartiles.html
^Great link. Check it out. :)

Answer 23

ok but what would the answer be ?

Answer 24

o.O
I told you.

First quartile = 58
Third Quartile = 69

Answer 25

ok sorry thank you

Answer 26

could you help me with something else please