Daily wages of a factory workers are recorded as:
The lower limit of the modal class is
(a) Rs 137
(b) Rs 143
(c) Rs 136.5
(d) Rs 142.5
Solution:
In the daily wages of workers of a factory are 131-136, 137-142, 142-148, …
which are not a proper class
So, proper class will be 130.5-136.5, 136.5-142.5, 142.5-148.5, …
Lower limit of a model class is 136.5 as 136.5-142.5 is the modal class. (c)
For the following distribution:
The sum of lower limits of the median class and modal class is
(a) 15
(b) 25
(c) 30
(d) 35
Solution:
From the given distribution
Sum of frequencies = 10 + 15 + 12 + 20 + 9 = 66
and median is 
Median class will be 10-15 and modal class is 15-20
Sum of lower limits = 10 + 15 = 25 (b)
More Solutions:
- The heights of 50 children were measured
- Find the value of p if the mean of the following distribution is 18.
- Calculate the Arithmetic mean, correct to one decimal place.
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- The measures of the diameter of the heads of 150 screw.
- The median, arranged in ascending order is 25.