CA Foundation · Quantitative Aptitude · Statistical Description of Data
In a 'more than' cumulative frequency table of 100 observations, the value for 'more than 50' is 70 and for 'more than 60' is 45. How many observations lie in the class 50–60?
There are 25 observations in the class 50–60. In a more than cumulative series, the frequency of a class is the more than value at its lower limit minus the value at its upper limit, which is 70 minus 45.
- A25Correct
- B45
- C30
- D70
Explanation
For a 'more than' series, class frequency = C.F.(>50) − C.F.(>60) = 70 − 45 = 25. Option 30 comes from 100 − 70, the number below 50. Option 45 is just the count above 60.
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