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
B
19
C
20
D
None of these

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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