# Mathmatical QuestionsQ.1. Calculate quartile deviation and its cofficient of rajesh 's income .markas : 12 34 5 6 7 8 9 19 1112income(Rs) : 239 250 251 251 257 258 260 261262 262273 275Q.2. Calculate meandeviation from (1) arithmeticmean (2) median :marks: 7 4 10 9 15 12 7 9 7Q.3. Calculate (a) median cofficient of dispersion , and (b) mean cofficient of dispersion from the following data :size of item : 4 6 8 10 12 14 16frequency : 2 4 5 3 2 1 4

Ans. 1) Ans. 2)

 Marks(X)  4 5 4.8 7 2 1.8 7 2 1.8 7 2 1.8 9 0 0.2 9 2 0.2 10 1 1.2 12 3 3.2 15 6 6.2  (i) Mean Deviation from Median =  Substituting the value in the formula,

Mean Deviation from Median = (ii) Mean Deviation from Mean =  Substituting the value in the formula,

Mean Deviation from Mean = Due to paucity of time we have provided solutions to only two of the questions. Try solving the remaining question yourself and in case of you face any difficulty do get back to us.

• 1

2. mean= EX/N  = 80/9 = 8.88  median =( n + 1) / 2 = (9 + 1) / 2 = 5th term = 9

• -2
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