Q. 34.2( 98 Votes )

# Class intervals in a grouped frequency distribution are given as 4 – 11, 12 – 19, 20 – 27, 28 – 35, 36 – 43. Write the next two class intervals. (i) What is the length of each class interval? (ii) Write the class boundaries of all classes, (iii) What are the class marks of each class?

Answer :

Next two class intervals 44 - 51 and 52 - 59.

(i) length of class interval = difference b/w upper and lower limit = 7

(ii)

(iii)

We know,

Class-mark

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PREVIOUSNumber of students in 30 class rooms in a school are given below. Construct a frequency distribution table for the data with a exclusive class interval of 4 (students).25 30 24 18 21 24 32 34 22 20 2232 40 28 30 22 26 31 34 15 38 2820 16 15 20 24 30 25 18NEXTIn the following grouped frequency distribution table class marks are given.(i) Construct class intervals of the data. (Exclusive class intervals)(ii) Construct less than cumulative frequencies and(iii) Construct greater than cumulative frequencies.

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