Help with probability? Explain
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Help with probability? Explain

[From: ] [author: ] [Date: 11-05-18] [Hit: ]
P[4] = 7choose 4* (1/6)^4 *(5/6)^2 = 0.p = 1/3,P[4] = 7c4 *(1/3)^4 *(2/3)^3 = 0.1280 -What do you need explained? What dont you understand? You kind of forgot to actually ask a question.......
A fair six sided die is tossed seven times in a row.

a. What is the probability that a "4" comes up exactly four times

b. What is the probability that a "4 comes up an even number of times

c. What is the probability that a number higher than "4" comes up exactly four times

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use binomial distribution

qa
n = 7, p = 1/6, q = 5/6
P[4] = 7choose 4* (1/6)^4 *(5/6)^2 = 0.0156 <--------

qb
computeP[0] + P[2] + P[4] + P[6] likewise

qc
p = 1/3, q = 2/3
P[4] = 7c4 *(1/3)^4 *(2/3)^3 = 0.1280 <-------

-
What do you need explained? What don't you understand? You kind of forgot to actually ask a question.
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