Question

Draw cumulative frequency curve (0 give) for the following distribution.

The sums of three terms in A.P is 33 and their product is 1155.find the terms.

Marks 5 - 10 10 - 15 15 – 20 20 – 25 25 - 30

Ab.of

students

7 9 12 8 6​

Answer 1

let the three terms be a-d ,a ,a+d

there sum is given as 33

so a+a-d+a+d =33

3a=33

a=11

also there product is 1155

so 11(11-d)(11+d) = 1155

121-d^2 = 105

d=+4 or -4

so tye three terms are 7 ,11 and 15