What will be the first class interval, if the fifth class interval is $60 - 65$ , the fourth class interval is $55 - 60$ and a total number of classes is limited to five.

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Solution

The correct option is B
The intervals should be divided as the following:
$\begin{matrix} 1^{s t} c l a s s i n t e r v a l & 40 - 45 2^{s t} c l a s s i n t e r v a l & 45 - 50 3^{r d} c l a s s i n t e r v a l & 50 - 55 4^{t h} c l a s s i n t e r v a l & 55 - 60 5^{t h} c l a s s i n t e r v a l & 60 - 65 \end{matrix}$
Therefore, the first class interval is $40 - 45$

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If the fifth class interval is 60-65 and fourth class interval is 55-60, then the first class interval is 45-50. ?

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Under Exclusive method,

(a) the upper class limit of a class is excluded in the class interval

(b) the upper class limit of a class is included in the class interval

(d) the lower class limit of a class is included in the class interval

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