A box contains 12 balls of which 5 red, and 7 arw blue, if 4 balls are drawn from the box, in how many ways can this be done of.
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Both of these conditions must be true in order for the assumption that the binomial distribution is approximately normal. In other words, if and
then we can use a normal distribution to get a good estimate of the binomial distribution. If either np or nq is smaller than 5, then a normal distribution wouldn't be a good model to use.
side note: q = 1-p is the complement of probability p