The two lines of regression are `8x-10y=66` and `40x-18y=214` and variance of x series is 9. What is the standard deviation of y series?

If y=2x+5 and variance of y is 16, then the standard deviation of x is

If y=2x+3 and variance of y is 4, then the standard deviation of x is-

If y=2x+3,and variance of y is 4,then the standard deviation of x is ____

The two lines of of regressions are x+2y-5=0 and 2x+3y-8=0 and the variance of x is 12. Find the variance of y and the coefficient of correlation.

The two lines of regression are x+ 2y- 5= 0 and 2x + 3y - 8=0 and the variance of x is 12. Find the variance of y and the coefficient of correlation.

In a partially destroyed laboratory record of an analysis correlation data, the following results only are legible: variance of x=9, regression equations 8x-10y+66=0, 40x-18y=214. What are (a) the mean values of x and y, (b) the standard deviation of y and (c) the coefficient of correlation between x and y?

If the two lines of regression are 4x-5y+33=0and20x-9y-107=0 , find the variance of y when sigma_(x)=3 .