What is the interquartile range of the data?

120, 140, 150, 195, 203, 226, 245, 280

A.
54

B.
90.5

C.
160

D.
235.5

Question

What is the interquartile range of the data? 

120, 140, 150, 195, 203, 226, 245, 280
  
 
 

 
 

  

  A. 
  54   
   

 
 

  

  B. 
  90.5   
   

 
 

  

  C. 
  160   
   

 
 

  

  D. 
  235.5

anonymous · Answer

@Shay17

amistre64 · Answer

q3 - q1

anonymous · Answer

so it wpold be b

yanasidlinskiy · Answer

Take a look at this: http://www.mathsisfun.com/data/quartiles.html

amistre64 · Answer

since there are 8 data elements,  and a quartile indicates 1/4

q = 8/4 = 2 ... which is going to mean we have to average some positional values

q3 = 2(3) = 6 ... the average of the 6th and 7th positions
q1 = 2(1) = 2 ... the average of the 2nd and 3rd positions

amistre64 · Answer

120, 140, 150, 195, 203, 226, 245, 280
                 |                                  |
              130                             238

so 238 - 130

amistre64 · Answer

lol,   130 is not the average of 140 and 150

amistre64 · Answer

238 - 145 ... assuming a got q3 right

anonymous · Answer

that's still not a choice

amistre64 · Answer

http://www.wolframalpha.com/input/?i=iqr%7B120%2C+140%2C+150%2C+195%2C+203%2C+226%2C+245%2C+280%7D lets just say b is good and call it a day :/

amistre64 · Answer

235.5
-145
-------
     90.5    i cant average for nothing at the moment

anonymous · Answer

|dw:1402359930125:dw|

anonymous · Answer

Idk how to accurately get answer but it is B