Question

If the standard deviation of 10 observations x1,x2,...,x10 is 4 that of another set of 10 observations y1,y2,...,y10 is 3 and also Xi=(xi-xbar)(yi-ybar),xbar is mean of all xi's and y is mean of all yi's sigmai=0 to 10 Xi=80 then standard deviation of ten observation (x1-y1),(x2-y2)...(x10-y10) is​

Answer 1

Answer:

Don't know about it sry