Math CC7/8 – Jan. 23
Things Needed Today (TNT):
Pencil/Math Notebook/Calculator
Math Notebook:
1.Topic: Pondering Possible & Probable
2. HW:WDYE p. 38 #8, 9, 26 & Tree
Diagram Worksheet
What’s Happening Today?
 HW Check Ins
Warm Up
Lesson 2.3 – Possible and Probable
Begin HW?
Warm Up
Show ALL work with Proper notation!!
A bag contains 3 red marbles, 7 blue
P(not red) = 1 – P(red)
marbles, and 6 yellow marbles.
What is the probability of drawing a
marble that is not red?
What is the probability of drawing a
marble that is either red or blue?
P(R or B) = P(Red) + P (Blue)
= 3/16 + 7/16
= 10/16
= 5/8
= 1 - 3/16
= 13/16
Question
How can you decide a game
is fair or not?
I will make this tree
diagram under the
document camera and
you (students) will copy
the tree diagram in
your math notebook!
Make sure you follow
along!!!!!
Add to notes
we created to answer the following questions.
1. The sample space for tossing three
coins is the list of ALL possible
outcomes.
2. There are 8 possible outcomes, and
they are all equally likely.
Show ALL work with Proper notation for #3 & #4 !!
P (3 coins match) = 2/8 or 1/4
P (exactly 2 coins match) = 6/8 or 3/4
No, this is not a fair game.
Tevy has more chances to score a point (2 coins
match), so he is more likely to win.
Exactly?
You would expect exactly 2 coins to match ¾ of the time.
¾ of 24 = 18
P (exactly 2 coins match) = 18/24= 3/4 trials
Santo means that all 3 coins match sometimes and
have a possible probability.
Tevy is saying it is not likely to be the case or to
happen especially since the probability is less than ½.
Modeling Tree Diagrams
 Take out Tree Diagrams
Worksheet!
 Work on this worksheet with
your partner.
 Finish for homework!
Homework: WDYE 2.3
pg. 38
#8, 9, 26 &
worksheet