A hint to get started
Choose between scaling one value and adding independent values
X and Y are independent continuous normal random variables with means 10,12 and standard deviations 2,3 respectively. Find
(a) ,
(b) ,
(c) ,
(d) ,
(e) x such that , for independent observations of X.
[1987/II/9]
CJC · Discussion · Question 7
A factor multiplies one variable’s variance by its square; independent copies contribute separate variances.