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jakeSanT5737
10.04.2020 •
Mathematics
An angle measures 130°.
Through what fraction of a does the angle turn?
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Ответ:
people have brown eyes. The probability that any one person has brown eyes is 0.8,
so the probability that they don't is 1 - 0.8 = 0.2. So the appropriate binomial terms are
(11 C 9)(0.8)^9*(0.2)^2 + (11 C 10)(0.8)^10*(0.2)^1 + (11 C 11)(0.8)^11*(0.2)^0 =
0.2953 + 0.2362 + 0.0859 = 0.6174, or about 61.7 %. Since this is over 50%, it
is more likely than not that 9 of 11 randomly chosen people have brown eyes, at
least in this region.
Note that (n C r) = n!/((n-r)!*r!). So (11 C 9) = 55, (11 C 10) = 11 and (11 C 0) = 1.