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?

CA Foundation Question

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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