A coin is tossed 900 times and head turns up 480 times. Test the hypothesis that the coin is unbiased.(Level of significance = 5%)

A coin is tossed 400 times and head appears 240 times. Test at 5% level of singificance about the unabiasedness of the coin.

A fair coin is tossed 10 times. Find the probability of getting exactly five heads.

I have a total of Rs 300 in coins of denomination Rs 1, Rs 2 and Rs 5, the number of Rs 2 coins is 3 times the numbers of Rs 5 coins. The total number of coins is 160. How many coins of cash denomination are with me?

Identify all the probable simple events obtained from the trial of tossing a coin two times and find their probabilities. Also describe one impossible event and one sure event associated with the above trial.

A game consists of tossing a one rupee coin. 3 times and noting its outcome each time. Hanif wins if all the tosses give the same result i.e., three heads or three tails, and loses otherwise. Calculate the probability that Hanif will lose the game.

two unbiased coins are tossed simultaneously find the probability of getting at least one head

Three unbiased coins are are tossed simultaneously. Find the probability of getting at least two heads.

Three unbiased coins are are tossed simultaneously. Find the probability of getting at must two heads.