The test scores for 9 students on the Unit 1 test were 35, 25, 50, 95, 80, 60, 45, 100, and 90. What is the value of the third quartile for this data set?
A. 85
B. 90
C. 92.5
D. 95

how would I go about finding the 3rd quartile?

Question

The test scores for 9 students on the Unit 1 test were 35, 25, 50, 95, 80, 60, 45, 100, and 90. What is the value of the third quartile for this data set?
	A.	85
	B.	90
	C.	92.5
	D.	95


how would I go about finding the 3rd quartile?

anonymous · Answer

@jim_thompson5910

anonymous · Answer

My answer is D right?

jim_thompson5910 · Answer

sort the data first

what do you get when you do that?

anonymous · Answer

so do i order them up from least to greatest?

jim_thompson5910 · Answer

yes

anonymous · Answer

okay i get 60

jim_thompson5910 · Answer

what's your sorted data set look like

anonymous · Answer

100, 95,90,80,60,50,45,35,25

jim_thompson5910 · Answer

sort it the other way around

jim_thompson5910 · Answer

smallest to largest

anonymous · Answer

25,35,45,50,60,80,90,95,100

jim_thompson5910 · Answer

good, what you do now is located the median

that's the middle most value

that is 60, so the median is 60

jim_thompson5910 · Answer

then what you do is break the data set into two halves

each half has the median in it

so you'll have this lower half

25,35,45,50,60

because it's below the median, and this upper half

60,80,90,95,100

since that's above the median

jim_thompson5910 · Answer

the median of the lower half is Q1

the median of the upper half is Q3

anonymous · Answer

so the small numbers are always on top right?

jim_thompson5910 · Answer

what do you mean

anonymous · Answer

so when you break them into two parts, is it always the first half thats on top?

jim_thompson5910 · Answer

the first half is the lower half (since it's below the median)

the second half is the upper half (since it's above the median)

jim_thompson5910 · Answer

not sure what you mean by "on top"

anonymous · Answer

oh nvm lol brain fart, so now how do we find our answer?

jim_thompson5910 · Answer

find the median of the upper half 

that will get you Q3

jim_thompson5910 · Answer

Q3 = 3rd quartile

anonymous · Answer

90

jim_thompson5910 · Answer

you got it

anonymous · Answer

yay!! does upper extreme mean upper half?

jim_thompson5910 · Answer

hmm I've never heard of that term, but it sounds like it

anonymous · Answer

ok

jim_thompson5910 · Answer

it could also be referring to the max

jim_thompson5910 · Answer

upper extreme = max  

but not sure

anonymous · Answer

okay cuz this is what I came across.



Identify the upper extreme on the box-and-whisker plot.

anonymous · Answer

A.	-5
	B.	-3.5
	C.	1
	D.	5

jim_thompson5910 · Answer

yeah i think they want you to find the max

jim_thompson5910 · Answer

ie, the right most point on the plot

anonymous · Answer

so the total max would be 5 then right?

anonymous · Answer

or i mean 1 lol

jim_thompson5910 · Answer

hmm which "one"....

anonymous · Answer

1

jim_thompson5910 · Answer

good, that's correct