Question

Case Study Based-

Cost of Living Index 140-150 150-160 160-170 170-180 180-190 190-200 Total
Number of weeks 5 10 20 9 6 2 52
(a) The mid-value (class-mark) of 160-170 is ……..


140


145


155


165​

Answer 1

Given :- Cost of Living Index 140-150 150-160 160-170 170-180 180-190 190-200 Total Number of weeks 5 10 20 9 6 2 52

(a) The mid-value (class-mark) of 160-170 is ……..

140

145

155

165

Answer :-

cost ------------- No. of weeks (Fi) ---------- Xi(mid value)

140 - 150 ------------- 5 ----------------------------- 145

150 - 160 ------------- 10----------------------------- 155

160 - 170 ------------- 20 ----------------------------- 165

170 - 180 ------------- 9 ----------------------------- 175

180 - 190 ------------- 6 ----------------------------- 185

190 - 200 ------------- 2 ----------------------------- 195

therefore,

→ The mid-value (class-mark) of 160-170 is = (160 + 170)/2 = 330/2 = 165 (D) (Ans.)

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