Transcript probability02

Chances Are…
You can do it!
Activity #2
There are 52 cards in a
deck. So what are my
chances of picking an
ace?
How many aces are in a deck?
How many cards are in a deck?
4
52
So I have a
4/52 or 1/13
chance of
drawing an
ace!
There are 9 homerooms in the school and
20 students in each homeroom. If the
principal selects 3 of the homerooms in
no specific order, what is the probability
of your room being selected?
A. 1/5
B. 1/3
C. 3/20
D. 9/20
There are 9 homerooms in the school and
20 students in each homeroom. If the
principal selects 3 of the homerooms in
no specific order, what is the probability
of your room being selected?
A. 1/5
B. 1/3
C. 3/20
D. 9/20
Jack’s sock drawer contains
10 blue socks and 12 gray
socks. The room is dark and
he cannot turn on the light.
What is the least number of
socks he must take out of the
drawer to be certain he has a
pair of the same color?
3 socks
…because if the first two do
not make a pair, then the
third will have to match one
of the first two!
End of Activity