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Question

If the class intervals are $$10-19, 20-29, 30-39, ...$$ then the upper limit of the first class-interval is


A
19.5
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B
19
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C
20
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D
None of these
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Solution

The correct option is A $$19.5$$
$$10-19, 20-29, 30-39, ...$$
Here the class intervals are not continuous. To make them continuous take the mean of upper limit of first class and lower limit of second class.
Mean $$= \dfrac{19+20}{2} = 19.5$$, which gives the upper limit of first class and lower limit of second class for the continuous class intervals.

Mathematics

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