Question

10) Based on past experience, it is assumed that the number of flaws per foot in rolls of grade 2 newsprint paper follows a Poisson distribution with an average of one flaw per 4 feet of paper (0.25 flaw per foot). What is the probability that in a: a) 4-foot roll there will be at least two flaws? b) 32-foot roll there will be at least eight flaws? c) 100-foot roll there will be at least four but no more than twelve flaws? d) 1000-foot roll there will be less than two hundred flaws?

Answer 1

sduton distibion bel too o 25 4--4oot Y ob p Catlecs P(Z2) - p (22 2) -0.25 -o 25 (o.25) e 6.25'e P(z2 D-02 64-19 22 toot oI = ४ ' p( at least g) p ( 8) O.S 4704 loxO.25= 25 T00 toot Yoll AD p 4 12)= P ( 12)- pa < 4) oOo14 - o ooo १4८2८12) = 0-0০।4-] A0OOrO 25 250