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Question

Find the mean using step-deviation.
Class IntervalFrequency35452004555250556550657570758540

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Solution

Let the assumed mean be 60.

Class size h = 10

xifidi=xi60ui=di/hfiui40200-20-2-40050250-10-1-2506050-000707010170804020280

fi=610

fiui=500

Mean= a + fiuifi×h
=60+(500610×10)

=608.20

=51.80

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