Pulse rate (per miute) of 30 persons were recorded as
61,76,72,73,71,66,78,73,68,81,78,63,72,75,80,68,75,62,71,81,73,60,79,72,73,74,71,64,76 and71.
Construct a frequency table using class-invervals of equal width,one class interval being (60-65).

The following are the marks of 60 students in Mathematics 16,13,5,80,86,7,51,24,56,70,19,16,36,34,42,34,35,73,55,75,52,72,97,74,45,62, 68,86,35,81,75,55,26,95,31,7,78, 92,62,52,56,15,63,25,54,44,47,27,17,4,30 Construct a grouped distribution table with width 10 each of the class starting from 0-9.

The weight of 50 apples form a consignement are as below 113,131,75,82,204,81,84,118,110,104,107,80,141,111,143,136,78,.90,110,98,106, 99,84,107,186,76,82,109,100,115,125,107,115,93,119,89,87,139,129,130,68,73, 195,111,125,85,92,126,70,75. form the grouped frequency table by dividing the variable range into intervals of equal width of 20 g so that the mid vlaue of the first class intervals is 70 g.

The marks scored by 40 students of class IX in mathematics are given below: 81, 56, 68, 79, 85, 13, 29, 68, 54, 73, 47, 35, 72, 64, 95, 44, 50, 77, 64, 35, 79, 52, 45, 54, 70, 83, 62, 64, 72, 92, 84, 76, 63, 43, 54, 38, 73, 68, 52, 54. Prepare a frequency distribution with class size of 10 marks.

A grouped frequency distribution table with classes of equal sizes using 63 - 72 (72 included) as one of the class is constructed for the following data : 30, 32, 45, 54, 74, 78, 108, 112, 66, 76, 88, 40, 14, 20, 15, 35, 44, 66, 75, 84, 95, 96, 102, 110, 88, 74, 112, 14, 34, 44. The number of classes in the distribution will be :