# Binomial probability

• August 13th 2007, 12:29 PM
Lawliet
Binomial probability
There's 60% chance that an item will work. You have 7 of these items. What's the chance that 5 out of these 7 items will work?

I don't need it for homework, but a real world problem. All I really need is an equation so that I can calculate it for other numbers, no major explanation required..
• August 13th 2007, 12:38 PM
galactus
Binomial.

$C(7,5)(0.60)^{5}(0.40)^{2}$