In: Statistics and Probability
Given independent random variables, X and Y, with means and standard deviations as shown, find the mean and standard deviation of each of the variables in parts a to d. |
|||
a) X−11 b)0.7Y c)X+Y d)X−Y |
Mean |
SD |
|
---|---|---|---|
X |
90 |
13 |
|
Y |
20 |
5 |
a) Find the mean and standard deviation for the random variable X-11.