3 Answered Questions for the topic Quartiles

Quartiles

06/08/16

upper quartile 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80

This is the example problem in my math book. I kept coming up with 78 as did an online quartile calculator but the book says the answer is 80. How are they coming up with that answer? 
Quartiles

03/07/13

the diference between quartiles of ungrouped data and grouped data set

what is the diference between the formuleas used?
Quartiles

10/04/12

what are the three quartiles of 12 10 11 7 9 10 5

i have to create a box and whisker plot what is the three quartiles of the followin numbers

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