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[SOLVED] Bernoulli, Poisson & Normal Probability
Homework Statement
Every chocolate bar contains 100 squares, with 10% of the individual squares presenting a health hazard to people consuming them.
(a) Using the Binomial, Poisson and Normal distributions, write down formulas for
the probability that a single chocolate bar has at least 3 but no more than 7 deadly
squares.
The attempt at a solution
For the binomial part, I've just done Pr(x=3) + Pr(x=4) +... Pr(x=7). Just wondering if that's what you would do?
I've done the same for the Poisson, using μ = 10.
I'm stuck on Normal distribution though.
I'm thinking of using
http://img294.imageshack.us/img294/5079/untitledzi8.jpg
but I don't know σ.
Homework Statement
Every chocolate bar contains 100 squares, with 10% of the individual squares presenting a health hazard to people consuming them.
(a) Using the Binomial, Poisson and Normal distributions, write down formulas for
the probability that a single chocolate bar has at least 3 but no more than 7 deadly
squares.
The attempt at a solution
For the binomial part, I've just done Pr(x=3) + Pr(x=4) +... Pr(x=7). Just wondering if that's what you would do?
I've done the same for the Poisson, using μ = 10.
I'm stuck on Normal distribution though.
I'm thinking of using
http://img294.imageshack.us/img294/5079/untitledzi8.jpg
but I don't know σ.
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