If two variables x and y are related by 2x + 3y –7 =0 and the mean and mean deviation about mean of x are 1 and 0.3 respectively, then the coefficient of mean deviation of y about mean is

- a)–5
- b)12
- c)50
- d)4

Correct answer is option 'B'. Can you explain this answer?

Related Test: Test: Measures Of Central Tendency And Dispersion- 1

By
hanish singhal
·
Sep 24, 2020 ·CA Foundation

Shalabh Jain
answered
Sep 30, 2018

2x+3y=7y=(7-2x)/3=7/3-2x/3mean of y=(7-2*mean of x)/3mean deviation of y=abs value of 2/3* mean deviation of xcoeff of mean deviation of y= mean deviation of y/mean of y

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