Mean (expected value)	Standard deviation
X	560	18
Y	270	24

Use the following information for Questions 1- 5.

The means (expected values) and standard deviations for two independent variables, X and Y, are given in the table below. These values are also give in the Excel sheet named "Q 1-5".

	Mean (expected value)	Standard deviation
X	560	18
Y	270	24

1. Find the following, giving answers to the nearest integer (no decimal places):

E(X-Y) =

SD(X-Y) =

Question 2

Find the following, giving answers to the nearest integer (no decimal places):

E(3Y) =

SD(3Y) =

Question 3

Find the following, giving answers to the nearest integer (no decimal places):

E(X+150) =

SD(X+150) =

Question 4

Find the following, giving answers to the nearest integer (no decimal places):

E(2.5X + 3.4Y) =

SD(2.5X + 3.4Y) =

Question 5

Find the following, giving answers to the nearest integer (no decimal places):

E(X+X+X+X+X) =

SD(X+X+X+X+X) =