QUESTION 1. Determine the mean and median of the following data.

3

5

12

13

19

15

7

3

11

6

1. Mean=Mean=
2. Median=Median=
3. Mode=Mode=

QUESTION 2. Randall's gas purchases last month were as follows:

Price per litre	$1.70	$1.56	$1.24
Number of litres	35.5	20.6	32.2

Calculate the total purchase price and the weighted mean price per litre. Round answers correct to the nearest cent.

1. Total purchase price = $$
2. Weighted mean = $$ per litre

QUESTION 4. The mean of the 5 observations in the following table is 4.

1. Fill in the missing values.

x x	xxx-x	(xx)2(x-x)2
-11
-4
-12
10
37

1. Determine the following sums: x=x= (xx)=(x-x)= (xx)2=(x-x)2=
2. Sample variance, s2=
3. Report the sample standard deviation accurate to 2 decimal places. Sample standard deviation, s=

QUESTION 5.