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MEAN (Frequency Distribution Series) Direct Method
Wages m= f fm 1. Find mid values m= (l + l )/2
2
1
(x) (l + l )/2 2. Find fm
2
1
0 – 100 50 2 100 3. Find ∑ fm and ∑ f
100 – 200 150 1 150 4. Apply formula
200 – 300 250 3 750 ∑ fm
X =
300 – 400 350 3 1050 ∑ f
400 – 500 450 1 450
= 2500
∑f = ∑fm= 10
10 2500
= 250
MEDIAN (Individual Series):
1. Arrange Data in Ascending Order
Wages Wages
(X) (X)
2. Median =
500 100 n1 + th
1 Size of item
200 200 2
2
100 300 = 5 + 1 th item
300 400 3 2 What if there are
400 500 = 3 item even number of
rd
items?
N = 5 = 300 Lets see!
MEDIAN (Individual Series):
Wages Wages 1. Arrange Data in Ascending Order
(X) (X)
2. Median =
500 100 1
th
200 200 2 Size of n1 + item
2
100 300 3
th
300 400 4 = 6 + 1 item
2
600 500 = 3.5 item
th
rd
th
400 600 = 3 item + 4 item = 300 + 400
2 2
N = 6 = 350
260 Touchpad Artificial Intelligence (Ver. 2.0)-XI

