If x and y are related by 2x+3y+4 = 0 and SD of x is 6, then SD of y is
  • a)
    22
  • b)
    4
  • c)
    5
  • d)
    9
Correct answer is option 'B'. Can you explain this answer?

CA Foundation Question

2 Answers
Chandna Arora answered Nov 06, 2018
2x+3y+4=0
 Or 
2x=3y4
 Or 
4var(x)=9var(y)
 Or, 
2sx=3sy
 Or 
12=3sy
Hence, 
sy=4
where 
s
x
 and 
sy
are the standard deviations of 
and 
respectively.

Gurmeet Gill answered Nov 06, 2018
It's simple 2x+3y+4=0X value is given is 6 2(6) +3y+4=0
12+3y+4=0
3y=16
Y=4
Ans= B is the correct answer

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