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Consider worker income from four departments: C1, C2, C3, and C4 with 3,2, 4, and 3 employees respectively: C1 C2 C3 C4 50 90

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P(A random Here worker is chosen vut of 18 workers) = ElY) Hence, Mean * (50+60 +40+90+105+ (8+23+22+25+32+10+6o E Y) = 47 •0E( xIC) = x (90 + 105) = 945 E(xI C) - 97.5 * For third clepartment, the 4 workers of depantment Cg) from the is chosen P(A w3rd depantment : * For the (3) x (18-2+ 25) - Var (x)G) = (xle]* = 6.5 the departrment : For Var (x[co) = fx (32*+ 10 + co)V(x) = v[E(xIc>]+ [v(xl6] that show To Var [e (mle)] = E(} *t(c) e117. 8680556 Var (×|cr) × PCc1). E( Vao (xIc)) - (6-66 x )

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