Question

What is the interquartile range of the following data set?

78, 90, 456, 676, 111, 381, 21
a.378
b.57
c.291
d.65

Answer 1

What are the quartiles?

Answer 2

idk. its not on the question

Answer 3

Yes it is! You are given the data. Define the quartiles!

Answer 4

First. You want to order it from least to greatest. So you would have:
21, 78, 90, 111, 381, 456, 676

Answer 5

i dont know what means

Answer 6

Here's how you find the quartile. What's the middle number in that data set?

Answer 7

111

Answer 8

Also, a quartile is defined as,
"Quartiles are the values that divide a list of numbers into quarters."

Answer 9

Now if you split the median number. What is the median in the left and the right?

Answer 10

is it 11

Answer 11

Hmm. Pretend

Answer 12

Pretend that [21,78, 90] was independent from [381, 456, 676]

Answer 13

ok

Answer 14

So what is the median of [21, 78, 90] and [381, 456, 676] ?

Answer 15

Something seriously wrong with an "interquartile rage" problem, when you don't seem to have been introduced to the concept of a quartile. Have you been attending class? Reading your book? Perhaps the one who gave you this assignment tore three pages out of their book? Something not right about this.

Answer 16

@ goldphenoix 78 and 456

Answer 17

Great! So:

Answer 18

Oh wait. If you are looking for the interquartile range, you would subtract the value of the upper quartile from the lower quartile. What does that give us?

Answer 19

378

Answer 20

Great! That's your answer!
I hope this help!
Also, http://www.mathsisfun.com/data/quartiles.html is a great link to help you with these questions!

Answer 21

ok thanks