1. ## probability

A firm that produces jewelry knows that 10% of its products have some flaws and must be classified as "cheap"

-Among six random selected pieces of jewelry, how likely is that only one is "cheap"?
-Among six randomply selected pieces of jewelry, what is the probability that at least two are "cheap"?

2. Originally Posted by Andreamet
A firm that produces jewelry knows that 10% of its products have some flaws and must be classified as "cheap"

-Among six random selected pieces of jewelry, how likely is that only one is "cheap"?
-Among six randomply selected pieces of jewelry, what is the probability that at least two are "cheap"?
Let X be the random variable number of cheap pieces of jewelry.

X ~ Binomial(n = 6, p = 1/10)

You want:

Pr(X = 1).

$\Pr(X \geq 2) = 1 - \Pr(X = 1) - \Pr(X = 0)$.