The diameters of circles (in mm) drawn in a design are given below: Diameters No. of children 33-36 15 37-40 17 41-44 21 45-48 22 49-52 25
Answers
Given : The diameters of circles (in mm) drawn in a design are given
To find : Mean Diameter
Solution:
Class f mean class A = (mean - 42.5)/4 Af
33-36 15 34.5 -2 -30
37-40 17 38.5 -1 -17
41-44 21 42.5 0 0
45-48 22 46.5 1 22
49-52 25 50.5 2 50
100 25
Mean = 42.5 + 4 ( 25 ) / 100
= 42.5 + 1
= 43.5 mm
Mean Diameter = 43.5
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