Stuck on a S1 Binomial Distribution question!! Watch

beca1998
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In a school in Wales the probability of someone speaking Welsh is 65%. We randomly pick 20 people. Use your model to discover the probability that at least 12 of them speak Welsh.
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rayquaza17
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What have you done so far?
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matthewdjones
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X is distributed binomially (20, 0.65).
So consider failure Y as B.D (20, 0.35)
so P(x>or= 12) then find P(Y<or =8) using tables
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