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Measurements of the diameters, in centimeters, of 20 copp...

Measurements of the diameters, in centimeters, of 20 copper spheres are distributed as shown below
Class boundary in cmfrequency3.353.4533.453.5563.553.6573.653.754
What is the mean diameter of the copper spheres?

A.

3.40cm

B.

3.58cm

C.

3.56cm

D.

3.62cm

Correct answer is C

x(mid point)ffx3.4310.23.5621.03.6725.23.7414.8

f = 20

fx = 71.2

mean = fxf

= 71.220

= 3.56