there is no effect on variance by the change u=x+20
variance of u=
solving we get
variance of u=248.44
hence, variance of x=248.44
The fomula u = x + 20 is used to find the standard deviation of the values of x given in a frequency table. It is found that "summation Fi = 40", "summation ui fi = 112 and "summation ui squared fi = 10208. Find the variance and mean values of x.
im so confused about the u = x +20