a well-mixed cookie dough will produce cookies with a mean of 5 chocolate chips apiece.

what is the probability of getting a cookie with more than 4 chips?

Poisson Distribution uses the formula: P(x; μ) = (e^{-μ}) (μ^{x}) / x!

e is always a constant number of 2.71828

x is the number you want to evaluate the probability of occurring

μ is the average, or mean.

So, you would use:

P(4;5)=(2.71828^{-5})(5^{4})/4!

Worked out, P(4;5)=0.559506714934787

SO: the probability of receiving a cookie with more than 4 chips is 0.559506714934787

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