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 cmfrequency3.35−3.4533.45−3.5563.55−3.6573.65−3.754
What is the mean diameter of the copper spheres?
3.40cm
3.58cm
3.56cm
3.62cm
Correct answer is C
x(mid point)ffx3.4310.23.5621.03.6725.23.7414.8
∑f = 20
∑fx = 71.2
mean = ∑fx∑f
= 71.220
= 3.56
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