Probability

Probability-the extent to which an event is likely to occur, measured by the ratio of the favorable cases to the whole number of cases possible.



BB-108
Toss three coins in the air. Make a list of all the possible outcomes, and find the probability that:
A) all of them land on heads up
B) two of them land with tails up


• List of all possible outcomes H= heads T=tails
• HHH; HHT; HTH; THH; HTT; TTH; THT; TTT
• A) There are only 8 possible outcomes of rolling the three coins. The probability of all the coins landing on heads is only 1 outcome out of 8 outcomes. Therefore the probability is 1/8.
• B) There are only 8 outcomes of rolling three coins. Only 3 of the outcomes have 2 coins being rolled a tails. Therefore the probability of rolling 3 coins and 2 of them landing on heads is 3/8.