a data is represented using the classes 20 – 29, 30 – 39, ………….., 120 – 129. What is the length of the class interval 90 – 99 ?

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a data is represented using the classes 20 – 29, 30 – 39, ………….., 120 – 129. What is the length of the class interval 90 – 99 ?

A) 90

B) 89.5

C) 10

D) 9

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Correct option is (C) 10

The exclusive form of given class-intervals is

19.5-29.5, 29.5-39.5, .... , 119.5-129.5

$\therefore$ Length of class-interval 90-99 = length of class-interval 89.5 - 99.5

= 99.5 - 89.5 = 10

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Correct option is  C) 10