From the given histogram find the cumulative frequency for class interval 20-30.
Class IntervalFrequencyC.F.0−106610−2091520−30122730−40103740−50542
From the table it is observed that cumulative frequency for the class interval 30-40 is 27.
If the cumulative frequency for the class interval (50-60) is 92, then find x
Class Interval0−1010−2020−3030−4040−5050−60Frequency 12 20 x 18 10 6