## ProbabilityWhat is probability?Probability is the likelihood of something happening in the future.How is it expressed?Probability is expressed as a fraction: the denominator is the
total
number of ways things can occur and the numerator is the number of things
that you are hoping will occur:
NUMBER OF THINGS YOU ARE LOOKING FOR PROBABILITY = --------------------------------------- TOTAL NUMBER OF THINGS POSSIBLE
Remember, probability is not dependent on what has happened in the
past.
So if you have tossed a coin and it has come up heads 6 times in a row,
the probability of it coming up heads a 7th time is still just 1/2.Now, here's a problem for you: There are 5 marbles in a bag: 4 are blue, and 1 is red. What is the probability that a blue marble gets picked? Probability of picking a blue marble = ______ |