Weight of 20 students is given in kilograms. Using class interval of 5, make a frequency distribution.

The weights of 20 students in a class are given below. Find the median of the above frequency distribution .

The weights of 20 students in a class are given below. The interquartile range of the above frequency distribution is "______" .

Find the mean weight of 20 students in your class.

(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 following are the marks obtained by 30 students of Class XI in Statistics. Prepare a frequency distribution by taking a class interval of 5 on exclusive basis.

Following are the marks obtained by 30 students in a examination Taking class intervals 0-10, 10-20,….. 40-50 construct a frequency table.

using class intervals 1-5,6-10,11-15,...... construct the frequency distribution following data:

Let x be the class mark & y be the upper limit of a class-interval in a continuous frequency-distribution. The lower limit of the class is: