Question

Nicole purchased gasoline 8 times in the last two months. The prices that she paid per gallon each time were $1.19, $1.14, $1.28, $1.09, $1.01, $0.99, $1.19, and $1.39. What is the mean, median, and mode of the prices per gallon that Nicole paid?

Answer 1

Mean: $1.16

Median: $1.165

Mode: $1.19

Explanation:

Order the numbers from smallest to largest:

$0.99

$1.01

$1.09

$1.14

$1.19

$1.19

$1.28

$1.39

The mean is the sum of these numbers divided by the count of the numbers.

0.99+1.01+1.09+1.14+1.19+1.19+1.28+1.39 = 9.28

There are 8 numbers.

9.28/8 = 1.16. That's your mean.

Median: That's the middle number when the numbers are lined up smallest to largest. We have 8 numbers so there's no single middle number. So we take the 2 numbers in the middle and average them (aka add them and divide by 2).

$0.99

$1.01

$1.09

$1.14 - - THESE are our 2 middle numbers.

$1.19

$1.19

$1.28

$1.39

So $1.14 + $1.19 = $2.33. Divide that by 2 = =1.165. That's your median.

The mode is the number that occurs the most times. (Sometimes there are multiple modes and sometimes there aren't any.)

So $1.19 is in there 2x. No other number repeats. That's the mode.