Find the mean of the quiz scores in the table below:?

[Colleen]

Find the mean of the quiz scores in the table below:

ValueFrequency
7 3
8 3
10 2
13 4

The mean is _______.
(Round to the nearest tenth)

 

[Katie]

10

You add all the scores, and divide by the total number of scores

 

[sahsjing]

(7*3+8*3+10*2+13*4)/(3+3+2+4) = 9.75 ~ 9.8

 

[active open programming]

Sum up the frequencies.

3 + 3 + 2 + 4 = 12

Weight for each from top to bottom:
3/12, 3/12, 2/12, 4/12

Weighted Mean:
(value)1 * (weight)1 + (value)2 * (weight)2 +... + (value)n * (weight)n

7 * 3/12 + 8 * 3/12 + 10 * 2/12 + 13 * 4/12
1/12 * ( 21 + 24 + 20 + 52 )
1/12 * ( 45 + 72 )
1/12 * ( 117 )
117 divided by 12, calculator

Mean: 9.75