Section-
Case study based questions are compulsory.
Artempt any four sub parts of each questions. Each sub part carries 1 mark
17. The daily expence of 100 families are given below. If the mean daily expenditure
Ementare (Rs.)
160-180
220-240
(The value of a
25
(1) Nome of these
B) The raize of
(5) None of sese
Meda class of se gradibution is
150-130
© 200-130 Nose of these
140-160
160-180
Esc class miral gember of sepancy
© 200-220
220-240 (1) None of de
Answers
Answer:
I don't have any idea about that
Sorry
Given : The daily expenditure of 100 families are given below.
mean daily expenditure is Rs.188
To Find : f₁ and f₂
Solution :
CI f class mark f * class mark
140 - 160 5 150 750
160 - 180 25 170 4250
180 - 200 f₁ 190 190f₁
200 - 220 f₂ 210 210f₂
220 - 240 5 230 1150
35 + f₁ + f₂ = 100 6150 + 190f₁ + 210f₂
35 + f₁ + f₂ = 100
=> f₁ + f₂ = 65
Mean = (6150 + 190f₁ + 210f₂ )/100
=> 188 = (615 + 19 f₁ + 21 f₂ )/10
=> 1880 = 615 + 19 f₁ + 21 f₂
=> 1265 = 19 f₁ + 21 f₂
1265 = 19 f₁ + 21 f₂
f₁ + f₂ = 65
on solving
f₂ = 50 and f₁ = 15
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