## Cloth is sold by the bolt where a bolt is 15 yards of material. If the expected number of blemishes per yard is 0.1 find the probability tha

Question

Cloth is sold by the bolt where a bolt is 15 yards of material. If the expected number of blemishes per yard is 0.1 find the probability that:

(a) A yard of cloth contains 1 or more blemishes.
(b) A bolt contains at most 2 blemishes.
(c) A lot of 30 bolts contains at least 50 blemishes.

in progress 0
1 month 2021-11-08T11:21:01+00:00 1 Answer 0 views 0

(a) The probability that a yard of cloth contains 1 or more blemishes is 0.0952.

(b) The probability that a yard of cloth contains at most 1 blemishes is 0.9953.

(c) The probability that in a lot of 30 bolts contains at least 50 blemishes is 0.2468.

Step-by-step explanation:

Let X = number of blemishes per yard of material.

The expected value of X is:

E (X) = λ = 0.1

The random variable  X follows a Poisson distribution with parameter λ = 0.10

The probability function of a Poisson distribution is: (a)

Compute the probability that a yard of cloth contains 1 or more blemishes as follows:

P (X ≥ 1) = 1 – P (X < 1)

= 1 – P (X = 0) Thus, the probability that a yard of cloth contains 1 or more blemishes is 0.0952.

(b)

Compute the probability that a yard of cloth contains at most 1 blemishes as follows:

P (X ≤ 1) = P (X = 0) + P (X = 1) Thus, the probability that a yard of cloth contains at most 1 blemishes is 0.9953.

(c)

In a lot of 30 bolts the expected number of yards of material is: Compute the probability that in a lot of 30 bolts contains at least 50 blemishes as follows:

P (X ≥ 50) = 1 – P (X < 50) **Use an online calculator or Excel to compute the probability.

Thus, the probability that in a lot of 30 bolts contains at least 50 blemishes is 0.2468.