the average pass % in a test is 70. find out the probability tht out of a group of 8 students atleast 5 pass.
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Originally Posted by Zandra the average pass % in a test is 70. find out the probability tht out of a group of 8 students atleast 5 pass. Do you mean that the average number of students who pass a test is 70% ? If so, then: Let X be the random variable number of students who pass. X ~ Binomial(n = 8, p = 0.7) Calculate $\displaystyle \Pr(X \geq 5)$.
Originally Posted by Zandra the average pass % in a test is 70. find out the probability tht out of a group of 8 students atleast 5 pass. Try Binomial distribution X-B(8 , 7/10) Let x be the random variable of students passing the test . $\displaystyle P(X\geq5)$
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