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Maths FROM 2
Chap11: elementary statistics
Calculation of arithmetic meanThis is found by adding the given data and dividing by the number of data points.
Ex: a) calculate the mean of the list of number 1, 4, 7, 8, 9
b) Calculate the mean of the list of numbers 3, 3, 3, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 10, 10, 10, 12, 12, 24
Solution:
a) mean = 1+4+7+8+95
= 5.8
b)
|
Number (x) |
Frequency (f) |
Total (f(x)) |
|
3 |
3 |
9 |
|
7 |
5 |
35 |
|
8 |
6 |
48 |
|
10 |
3 |
30 |
|
12 |
2 |
24 |
|
24 |
1 |
24 |
∑f = 20, ∑f(x) = 170
Mean = 17020
= 85
par Claude Foumtum