The diameters of circles in mm drawn in a design are given below 3 mar...........

The diameters of circles (in mm) drawn in a design are given below: (3 marks)

Diameters 33 – 36 37 – 40 41 – 44 45 – 48 49 – 52 No. of circles 15 17 21 22 25

Calculate the standard deviation and mean diameter of the circles.

[Hint first make the data continuous by making the classes as 32.5-36.5, 36.5-40.5, 40.5-44.5, 44.5 – 48.5, 48.5 – 52.5 and then proceed.]

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