Which of the following value is the measure of dispersion "range" between the scores of ten students in a test.

Which of the following value is the measure of dispersion "range" between the scores of ten students in a test.

The scores of ten students in a test are 17, 23, 30, 36, 45, 51, 58, 66, 72, 77.
A . 90
B . 60
C . 70
D . 80

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Answer: B

Explanation:

The correct answer is: 60

Range is the interval between the highest and the lowest score.

Range is a measure of variability or scatteredness of the varieties or observations among themselves and does not give an idea about the spread of the observations around some central value. Symbolically R = Hs – Ls.

Where R = Range; Hs is the ‘Highest score’ and Ls is the Lowest Score.

The scores of ten students in a test are: 17, 23, 30, 36, 45, 51, 58, 66, 72, 77.

The highest score is 77 and the lowest score is 17.

So the range is the difference between these two scores Range = 77 – 17 = 60