Probabaility that a pen manufactured by a company will be defective is 1/10.If 12 such pen are manufacturd,find yhe probability for?

1. exactly two will be defective

2. at least two will be defective

3.none will be defective

THANKS !!!!!!

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- Oct 6th 2008, 03:14 AMSameeraProbability ???
**Probabaility that a pen manufactured by a company will be defective is 1/10.If 12 such pen are manufacturd,find yhe probability for?**

1. exactly two will be defective

2. at least two will be defective

3.none will be defective

THANKS !!!!!! - Oct 6th 2008, 03:55 AMmr fantastic
Are you familiar with the binomial distribution?

Let X be the random variable*number of manufactured pens that are defective*.

X ~ Binomial(n = 12, p = 1/10).

Calculate:

1. $\displaystyle \Pr(X = 2)$

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

3. $\displaystyle \Pr(X = 0)$. - Oct 6th 2008, 03:56 AMKai