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

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

If the variance is 0.49 then the standard deviation is ____.

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?

Given r= sqrt((3)/(4)), b_(yx)= (1)/(2) , variance of x=12, then standard deviation of y is

If the standard deviation of x, y, z is p then the standard deviation of 3x+5, 3y+5, 3z+5 is ___.