Question

The average Percentage of failure in a certain examination is 40. What is the probability that out of a group of 6 candidates,at Least 4 passing the examination?

Answer 1

Answer:

Here,

Total percentage of failure = 100%

n(S) = 100

And,

Average percentage of failure = 40%

n(A) = 40

Let A be the event that 4 candidates out of 6 passing the exam

n(A) = 4

Now,

P(A)= n(A)

n(S)

= 4/6

=2/3

Ans. : Probability = 2/3