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+1 vote
16.3k views
in Statistics by (56.3k points)

Find the mean:

Class interval: 10-30 30-50 50-70 70-90 90-110 110-130
Frequency: 5 8 12 20 3 2

1 Answer

+1 vote
by (30.5k points)
selected by
 
Best answer

Let’s consider the assumed mean (A) = 60

From the table it’s seen that,

A = 60 and h = 20

Mean = A + h x (\(\frac{Σf_i u_i}{N}\))

= 60 + 20 x (\(\frac{14}{50}\))

= 60 + \(\frac{28}{5}\)

= 60 + 5.6

= 65.6

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