Q. 9 A5.0( 7 Votes )

# Let us find the m

Answer :

To find mean using step-deviation method, we need to create a table showing frequencies, midpoints and deviations.

Observe that class size, h = (30 – 0) = (60 – 30) = … = (150 – 120) = 30 We have,

A = 75

∑fiui = 2

∑fi = 80

h = 30

By step deviation method, we can give the formula of mean as: Using the above values, we have     Mean = 75.75

Thus, mean is 75.75.

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