If 10 is the mean deviation of ' n ' observations x1,x2, x3,…,xn then the mean deviation of the observations 32x1+5,32x2+5,32x3+5,….,32xn+5 is
Topic: JEE PYQ
Answer: C. Full step-by-step solution below.
A325
B940
C320
D15
Correct answer: C
Solution
(c) Given observation are x1,x2,x3…..xn. x=nx1+x2+x3+….+xn New x=n1(32x1+5+32x2+5+…..+32xn+5) New x=32x1+5 Mean deviation of the observations 32x1+5,32x2+5,…….⋅32xn+5NewM.D.=n1∑(xi−x)=n1∑(32xi+5−32x+5)=n1((32x1+5−2x−5)+(32x2+5−2x−5)+) (…+(32xn+5−2x−5))=((32n1(x1−x)+(x2−x)+(x3−x)+….+xn−x)) =32×10=320