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In 2000, the average charge of tax preparation was 95 . Assuming a normal distribution and a ...
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#:9547210 when x = 80; z: x—fl : 80—95 :_1.5 0' 10 when x = 90; Z:x—,u : 90—95:_0.5 0' 10 The probability that tax preparation fees were between $80 and $90 is p(80<x <90) 2 p(—l.5 < z < —0.5) = p(—00 < z < —0.5)—p(—°C < z < —1.5) 20.3085 — 0.0668(by 3 tan dard normal table) =0.24l7
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