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Calculate the range and coefficent of range from the following data:
marks 10-19 20-29 30-39 40-49 50-59 60-69
No.of students 6 10 16 14 8 4
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Solution:

C.I 9.5-19.5 19.5-29.5 29.5-39.5 39.5-49.5 49.5-59.5 59.5-69.5
frequency 6 10 16 14 8 4

Range = L - S

= 69.5 - 9.5

= 60

Coefficientofrange=LSL+S

69.59.569.5+9.5

=0.76

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