The Turkuman Rug Company buys medium grade carpet in 100-foot rolls. The average number of defects per roll is 1.8. Assuming that these data follow a Poisson distribution, use the Poisson spreadsheet template to answer the following questions.
a) What is the probability of finding exactly seven defects in a carpet roll chosen at random?
b) What is the probability of finding four or fewer defects in a carpet roll?

 

Turkuman Rug Co.
Poisson Probability Distribution Template
Enter data only in yellow-shaded cells.
Desired number			7
Distribution mean			1.8
Calculated probability			0.00201
x	f(x)	F(x)
0	0.16530	0.16530
1	0.29754	0.46284
2	0.26778	0.73062
3	0.16067	0.89129
4	0.07230	0.96359
5	0.02603	0.98962
6	0.00781	0.99743
7	0.00201	0.99944
8	0.00045	0.99989
9	0.00009	0.99998
10	0.00002	1.00000