Home
Class 12
MATHS
Let x1 ,x2 , x3 ………xk be k observations ...

Let `x_1 ,x_2 , x_3 ………x_k` be k observations and `w_i = ax_i +b` for I = 1,2,3……. K , where a and b are constants . If mean of `x_(i)` is 52 and their standard deviation is 12 and mean of `w_i` is 60 and their standard deviation is 15, then the value of a and b should be 15, then the value of a and b should be

Promotional Banner

Similar Questions

Explore conceptually related problems

Let 1 x_(1),x_(2)….x_(n) be n obervations .Let w_(i)=lx_(i) +k " for " i=1,2….n, where l and k are constants. If the mean of x_(i) is 48 and their standard deviation is 12 the mean of w_(i) 's is 55 and standard deviation of w_(i) is 15 then the value of l and k should be

Let x_(1),x_(2),x_(n) be x_(n) observations.Let y_(i)=ax_(i)+bf or i=1,2, nwhereaandb are constants.If the mean of xi's is 48 and their standard deviation is 12, the mean of yi's is 55 and standard deviation of yi's is 15, the values of a and b are a=1.25,b=-5 (b) a=-1.25,b=5backslash(c)a=2.5,b=-5(d)a=2.5,b=5

The variance of 6x_(i) + 3 is 30 , find the standard deviation of x_(i) .

The mean of 40 observations 20 and their standard deviation is 5. If the sum of the square of the observations k, then the value of (k)/(1000) is

The mean and standard deviation for a,b and 2 are 3 and 1 respectively,then value of ab is

A set of n values x_(1),x_(2),……,x_(n) has standard deviation sigma . What is the standard deviation of n values x_(1)+k, x_(2)+k….,x_(n)+k?