Math Help - Binomial Theorem

1. Binomial Theorem

Acompany produces a large output of ligght bulbs everyday. if a sample of 10 bulbs is taken at the end of the day, what's the probability that atleast three bulbs are faulty, if 5% of the day's production are faulty?

2. Originally Posted by Rose Wanjohi
Acompany produces a large output of ligght bulbs everyday. if a sample of 10 bulbs is taken at the end of the day, what's the probability that atleast three bulbs are faulty, if 5% of the day's production are faulty?
Given that you know that it's the Binomial that's needed, how about writing the formula and saying what you'd use for the variables...? The answer's pretty much there - what part are you getting stuck on?

3. binomial

i still can't derive the formula for the question but i was thinking ,how about
1-{p(all good)+p(one faulty)+p(twofaulty)}what do you think?

4. Originally Posted by Rose Wanjohi
i still can't derive the formula for the question but i was thinking ,how about
1-{p(all good)+p(one faulty)+p(twofaulty)}what do you think?
So far, so good. Now apply the usual formula to each of the terms in the braces.