# Ex 15.2, 10 - Chapter 15 Class 11 Statistics (Term 1)

Last updated at Dec. 12, 2016 by Teachoo

Last updated at Dec. 12, 2016 by Teachoo

Ex 15.2, 10 The diameters of circles (in mm) drawn in a design are given below: h = class size = 36.5 β 32.5 = 4 Mean(π₯ Μ ) = A + (ββπππ¦π)/(ββππ) Γβ = 42.5 + 25/100 Γ4 = 42.5 + 1/4 Γ4 = 43.5 Variance (π)2 = β2/N2 [πββπππ¦π2 β (ββπππ¦π)^2 ] = 42/1002 [100 Γ (199) β (25)2] = 16/10000 [19900 β625] = 16/10000 Γ 19275 = 30.84 β΄ Standard deviation (π) = βVariance π = β30.84 = 5.55