PROBABILITY Mrs. Leahy’s 3 rd Hour – 6 th Grade Advanced Math

What is Probability?  Probability is the measure of how likely an event is to occur.

Unlikely or Likely?????  For each of the following questions, please decide if you think that the event or situation is most likely to happen or unlikely to happen.  Put a U on your dry-erase board for unlikely and a L for likely. Please use your own opinion to form your own decision. Boards will be held up when teacher asks for “boards”. Please, erase your board in between exercises.

LIKELY OR UNLIKELY  1. You win the state lotto!!!!!

LIKELY OR UNLIKELY  2. It will snow in July!!!!!

LIKELY OR UNLIKELY  3. Running laps in gym class.

LIKELY OR UNLIKELY  4. Your power goes out during a thunderstorm.

LIKELY OR UNLIKELY  5. You win a coin toss.

Now, how do I find a probability?  A probability:  Is a Wanted Outcome out of Total Possible Outcomes  Can be written as a fraction.

Probability-Example 1  If I roll a dice once, what is the probability that I will roll a 1?????????  A. 1/6 One chance out of six. There is only one 1 on a single dice, and there are 6 possible outcomes.

HINT  Reminder: Don’t forget to reduce your fractions!!!!!!!!!!!!!!  Ex. Rolling a 2 would be 2/6. Reduced this becomes 1/3!!!!!!!!!!!

LET’S FIND THE PROBABILITY……………..  Please figure out the following probabilities on your dry-erase board. Hold up your boards when you hear “boards”.  OK, HERE WE GO………………..

FIND THE PROBABILITY  1. What is the probability of flipping a coin once and getting heads?

#1 Answer ½½½½

FIND THE PROBABILITY  2. What is the probability of rolling a three with one dice?

#2 Answer  1/6

FIND THE PROBABILITY  3. What is the probability of rolling one dice and getting an odd number?  Hint: What is an odd number?

#3 Answer  3/6  Reduced: ½ This is your final answer!!!

FIND THE PROBABILITY  4. What is the probability of rolling one dice and getting a multiple of 3??  Hint: Remember our ‘Buzz’ Game!!

#4 Answer  2/6  Reduced: Your final answer is 1/3.

FIND THE PROBABILITY  5. You have a spinner with numbers On your first spin what is the probability that you will get an even number???

#5 Answer  10/20  Reduced: Your final answer is ½.

REFLECTION  Reflect: How did you do??????  Lights………………………  Time to Move on?????????  OR  More Practice Needed???????????

REVIEW  Probability is the measure of how likely an event is to occur.  Probabilities can be written as fractions in simplest form.

Independent/Group Practice  With a partner you will be given a practice probability review sheet.  Please make sure to check and compare your probabilities with one another.  You may use one worksheet with both of your names on it.

What’s Next???  Tomorrow we will review your partner probability worksheets.  Next week, you will be conducting some experimental probabilities based on constructing your own spinners!!!!!