A company has 200 machines. Each machine has 12% probability of not working.
If you were to pick 40 machines randomly, the probability that 5 would not be working is

Question

A company has 200 machines. Each machine has 12% probability of not working.
If you were to pick 40 machines randomly, the probability that 5 would not be working is

anonymous · Answer

the probability that all would be working is 
, and the probability that at least one machine would be working is

anonymous · Answer

@mathmale @mathmath333 @math_man21

agent0smith · Answer

Use binomial probability. I assume you have the formula. 

p=0.12
n=40
k=5

anonymous · Answer

i do not @agent0smith

agent0smith · Answer

Google it then, binomial probability formula

anonymous · Answer

is this what you mean

anonymous · Answer

n = number of trials
k = number of successes
n – k = number of failures
p = probability of success in one trial
q = 1 – p = probability of failure in one trial

anonymous · Answer

@agent0smith

agent0smith · Answer

Yes but that isn't the formula.

anonymous · Answer

what would i be looking for

agent0smith · Answer

The formula. It comes up in the very first result if you search what I said.

anonymous · Answer

attachment

agent0smith · Answer

Yes, so... use it.

anonymous · Answer

man i cant read that

anonymous · Answer

2.8366108223120563e-7n @agent0smith

anonymous · Answer

rounded to the thousandth place its 0

agent0smith · Answer

That's probably not correct.

You showed no work, so I have no idea how you arrived at that answer.