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?

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

By
Krishna Vindurani
·
4 weeks ago ·CA Foundation

2 Answers

Chandna Arora
answered
Nov 06, 2018

Or

Or

Or,

Or

Hence,

where

and

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

12+3y+4=0

3y=16

Y=4

Ans= B is the correct answer

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