Çözüldü Graph Reading - Median

A slightly hardened version of a solved problem in an SAT preparatory book:

https://i72.servimg.com/u/f72/19/97/10/39/median13.png
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(Page 1085, Question 2, Solution: Page 1140)

The number of students: 3·1 + 3·2 + 1·3 + 2·4 = 3 + 6 + 3 + 8 = 20

https://i72.servimg.com/u/f72/19/97/10/39/median14.png

Notes:
1. In the original question it is the word "Twenty" instead of "Some" at the beginning.
2. Using a classification table;

Kod:

Fruits/Vegetables        Frequency        Cumulative Frequency
     1 - 2                   2                      2
     3 - 4                   5                      7
     5 - 6                   6                     13
     7 - 8                   6                     19 
     9 - 10                  1                     20

Based on the frequency column, the Median is the 3rd value which is 6.
Another approximate value for Median = 5 + (6 - 5)·{ [ (20 / 2) - 7 ] / 6 } = 5.5 ====> 6 =====> Correct choice is C.