7.1 Understanding Likelihood and Probability

If an event can occur with a probability of 21/23, then we can say that it ...

• will always occurr

• cannot occur

• is less likely to occur

• is likely to occur

If an event can occur with a probability of 3/8, we can say that it...

• will always occur

• cannot occur

• is less likely to occur

• is likely to occur

What is the likelihood of flipping heads on a coin?

• impossible

• unlikely

• as likely as unlikely

• likely

Probability is a number that describes the...

• relationship between two sets of data.

• percent of change.

• distance around a figure.

• likelihood that an event will occur.

Which event has a probability of zero or impossible to happen?

• Rolling a 7 on a 6 sided dice.

• Tossing a coin and landing on heads.

• Rolling an even number on a dice.

• The sun rising in the morning.

If a six-sided die is rolled, what is the probability that it will land on an odd number?

Probability can be written as...

(Choose ALL that apply!)

• Percents

• Fractions

• Decimals

• Words

At a community swimming pool there are 2 managers, 8 lifeguards, 3 concession stand clerks, and 2 maintenance people.  If a person is selected at random, find the probability that the person is either a lifeguard or a manager.

• 2/3
• 8/15
• 2/15
• not enough information

You pick a marble from this bag.
What is the probability you will choose either a black or white marble?

• 3/5
• 9/100
• 1/10
• 2/5

A jar contains 2 pink, 6 red, and 4 blue marbles. If you pick one marble without looking, what is the probability that the marble you pick will be red or blue?

• 5/6
• 1/2
• 1/3
• 1/6