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P. 261
Mean
Mean is an essential concept in statistics. The mean is the average or the most common value in a group of
numbers.
MEAN Direct Method
(Individual Series):
1. Find ∑x by adding all the values
Wages
(x) ∑x = 1500
100
2. Find total number of items (N)
200
300 N=5
400
3. Apply formula
500
∑x = 1500 ∑ x
X = = 1500 = 300
N 5
MEAN (Discrete Series): Direct Method
(Frequency Array)
Wages f fx 1. Find fx
(X)
2. Find ∑fx and ∑f
100 2 200
3. Apply formula
200 1 200
∑ fx
300 3 900 X =
∑ f
400 3 1200
500 1 500 = 3000
10
∑f = ∑fx=
10 3000 = 300
Data Analysis (Computational Thinking) 259

