Question

the overall percentage of failures in a certain examination is 40 what is the probability that out of a group of 6 candidate at least for pass the examination ?

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Answer 1

Explanation:

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6

p(passed) = .6

p(failed) = .4

Binomial distribution

for example for 4 of 6 passed

C(6,4) .6^4 .4^2

C(6,4) = 6!/[ 4!(2!)] = 6*5/2 = 15

15 * .6^4*.4^2 = .311

do that also for 6,5

and for 6,6

and add those three results