REVIEW

WHAT’S THE PERCENT OF… Annabeth found the following hats in her closet: 1 blue Yankees hat1 blue Mariner’s hat 1 orange Giants hat1 red Red Sox hat 2 white Dodgers hats1 white Cubs hat and 1 red Braves hat What percentage of her hats are blue? Number of blue hats: 2 8 Total number of hats:

VOCAB! Chance Event- situation whose ultimate outcome is uncertain Probability – is a measure of how likely it is that an event will happen. Sample Space - set of all possible outcomes of a chance experiment Outcome-each possibility of an event Theoretical Probability – it is how a probability of an event “should” happen Experimental Probability – the probability of an event occurring when an experiment was conducted

CHANCE EXPERIMENTS Outcome Frequency Jenna spins a spinner with 6 sections of equal area, like the one below 50 times. She records her results in a table. What is the chance experiment? What is the sample space? Are the events of landing on a 2 or 5 equally likely? Spinning the spinner 1, 2, 3, 4, 5, 6 Yes, the sections on the spinner are the same size

HOW LIKELY IS IT? = 6 A bag contains 3 red marbles, 6 white marbles, and 7 blue marbles. Find the probability of drawing a white marble. Write your answer as a fraction in simplest form. Number of white marbles Total number of marbles = = 16 P(event) = number of favorable outcomes total number of possible outcomes Number of favorable outcomes = Total number of possible outcomes =

You roll a number cube 100 times. Your results are given in the table below. Find the experimental probability of rolling a 6. Write your answer as a percent. P(rolling a 6) = Number of favorable outcomes Total number of rolls = 0.18 = 18% If you rolled the number cube 300 times then how many times would you predict that you would roll a 3 according to your experiment? 60 times

Remember: NO TALKING! You can use ALL your notes and practices When you’re finished with your skills check please flip it over and put it in the corner of your desk. Once you’ve finished your skills check you can work quietly at your desk.