A) Find the arithmetic mean by step deviation method for the
given data.
Class Interval
10-20
20-30 30-40
40-50
50-60
60-70
Frequency
7
12
8.
7
11
5
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A) Find the arithmetic mean by step deviation method for the
given data.
Class Interval
10-20
20-30 30-40
40-50
50-60
60-70
Frequency
7
12
8.
7
11
5
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Answer:
so the answer is given there it is 38.6
for this method first we should find
xi
di
ui
and fiui
to find xi we should add class interval and divide by 2 for eg : 10-20 , 10+ 20/2 , 30/2, = 15
and then to find di we should subtract xi - a
a is the mid number in xi
to find ui we should divide xi- a by h
h is the difference of between class interval eg : 10 - 20 and the difference is 10
fiui is finded by multiply by both fi and ui