can you work out ?
if so, you can use:
which will give you and hence
repeat the process to get
Finally, you can use:
to get the variance of the sum.
i have never herd this one it is nt in my sylabus
covarance is also not in my sylabus and i dont know any resource i cn find to find this one out.. i looked on many website and i not find ...
also there is not muhat 1 and muhat 2. .. it is muonehat and mutwo hats. like U '',