Posted by **autumn** on Monday, April 26, 2010 at 9:05pm.

A company manufactures caclculators in batchers of 64 and there is a 5% rate of defects. Find the probability of getting exactly three defects in a batch

- statistics -
**Mary**, Monday, April 26, 2010 at 10:45pm
I think I remember a bit of this from when we were generating OC curves for a math modeling project last semester.

In my notes there is the equation:

P(d)= (n!/(d!(n-d)!))*(p^d)(1-p)^(n-d)

It's assumed that the total lot is very large, so when you take n, the sample size, out doesn't change the remainder.

P(d)= prop of observing exactly d

number of defectives= d

random sample= n

p= fraction of defectives per lot.

Hope this helps

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