Find the probability of guessing correctly at least 5 of the eight answwers in a true false objective test.

Find the probability of guessing correctly at least 5 of the eight answers in a True-False objective test.

What is the probability if guessing correctly at least six of the ten answers in a TRUE-FALSE objective test ?

What is the probability of guessing correctly at least 8 out of 10 answer on true-false examination?

Find the probability of getting at least one tail in 4 tosses of a coin.

Eight unbiased coins tossed simultaneously. Find the probability of getting exactly five heads and at least five heads.

Find the probability of drawing 4 cards from a pack of 52 cards such that at least two cardswill be aces.

A couple has two children, (i) Find the probability that both children are males, if it is known that at least one of the children is male. (ii) Find the probability that both children are females, if it is known that the elder child is a female.

In a test an examine either guesses or copies or knows the answer to a multiple choice question with four choices. The probability that he makes a guess is 1/3 and the probability that the copies the answer is 1/6. The probability that his answer is correct, given that he copied it, is 1/8. Find the probability that he knew the answer to the question, given that he correctly answered it.

On a multiple choice examination with 4 possible answers for each of 6 questions the probability that a student would get at least two correct answers just by guessing is -

In answering a question on a multiple choice test, a student either knows the answer or guesses. Let (3)/(4) be the probability that he knows the answer and (1)/(4) be the probability that he guesses. Assuming that a student who guesses at the answer will be correct with probability (1)/(4) . What is the probability that the student knows the answer given that he answered it correctly?