REVIEW

WHAT’S THE PERCENT OF…Annabeth found the following hats in her closet:

1 blue Yankees hat 1 blue Mariner’s hat

1 orange Giants hat 1 red Red Sox hat

2 white Dodgers hats 1 white Cubs hat

and 1 red Braves hat

What percentage of her hats are blue?Number of blue hats:

28Total number of

hats:¿𝟏𝟒

=𝟎 .𝟐𝟓=𝟐𝟓%𝟐𝟖

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 1 2 3 4 5 6

Frequency

6 10 8 11 6 9

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 spinner1, 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= 3 + 6 + 7

= 16

P(event) = number of favorable outcomes

total number of possible outcomesNumber of favorable outcomes =

Total number of possible outcomes =

P(white) =

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)=18100

Number of favorable outcomesTotal 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

300100

20 x

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.