The class marks of a distribution are 12, 18, 24, 30. Find the class interval.

The class marks of a distribution are 62, 67, 72, 77, 82 and 87. Find the class-size and class-limits

The two consecutive class marks of a distribution are 52 and 57. Find the class limits of the two intervals.

The class marks of a frequency distribution are 15, 20, 25, 30, ..... The class corresponding to the class mark 25 is

(i)Find the class mark of the class 90-120. (ii)In a frequency distribution, the mid-value of the class is 10 and width of the class is 6. Find the lowe limit of the class. (iii)The width of each of the five continuous classes in a frequency distribution is 5 and lowe class limit of the lowest class is 10. What is the upper class limit of the highest class? (iv) The class marks of a frequency distribution are 15,20,25...... Find the class corresponding to the class mark 20. (v)In the class intervals 10-20, 20-30, find the class in which 20 is included.

The class size of a distribution is 25 and the first class-interval is 200-224. There are seven class-intervals. Write the class-intervals. Write the class-marks of each interval.

The class size of a distribution is 25 and the first class-interval is 200-224. There are seven class-intervals. Write the class-intervals. Write the class-marks of each interval.

The class marks of a frequency distribution are 104, 114, 124, 134, 144, 154, 164. Find the class size

The mid-values of the class-intervals of a frequency distribution are respectively 15,20,25,30,…… The class interval of which the mid-value is 20 is

If the class marks of a continuous frequency distribution are 22, 30, 38, 46, 54, 62 then the class corresponding to class mark 46 is _____