SAUSD CAHSEE Math Problem of the Day -- Week 13
Day 1
Steps to find/calculate a probability
1. Find the number of possible outcomes.
2. Find the number of favorable events.
3. Write as a fraction
Anna has the letter tiles below in a bag.
1)
If Anna randomly selects a tile from the bag,
what is the probability she will select a C?
2)
If Anna randomly selects a tile from the bag,
what is the probability she will select a T?
Example 1: If you role a number cube, what is
the probability of rolling a 5?
1. All possible outcomes when rolling a die
are 1, 2, 3, 4, 5, 6  six in total
2. Favorable event: rolling a number 5 
one in total
3. Probability of rolling a 5 is 1 out of six or
1/6.
The probability of rolling a 5 is 1/6.
One out of six.
Day 2
Example 2: If you roll a number cube, what is
the probability of rolling an even number?
1. All possible outcomes when rolling a die
are 1, 2, 3, 4, 5, 6  six in total
2. Favorable event: rolling an even number
2, 4, or 6  three in total
3. Probability of rolling an even number is 3
out of 6 or 3/6 =
Fran has 16 Cds in a box; 6 country, 6 rock, 2
dance, and 2 classical.
1)
If she takes out one CD without looking, what
is the probability that she will pick a dance
CD?
2)
If she takes out one CD without looking, what
is the probability that she will pick a rock or
country CD?
The probability of rolling a 5 is 1/6.
One out of six.
Susan Mercer, Laura Westermeier, Ed.D.
Educational Services, SAUSD
Fall, 2007
Week 11 – Answer Key - Page 1 of 2
SAUSD CAHSEE Math Problem of the Day -- Week 13
Day 3
A bucket contains 3 bottles of apple juice, 2 bottles of orange juice, 6 bottles of tomato juice, and 8
bottles of water. If Kira randomly selects a bottle, what is the probability that she will select a
drink other than water?
3
11
8
1
a.
b.
c.
d.
4
19
19
4
€
€
€
€
Day 4
The spinner shown to the right is fair. What is the probability that the
spinner will not stop on red if you spin it one time?
a.
1
4
b.
€
1
3
c.
€
3
4
d.
€
4
3
€
Day 5
Mr. Gulati is holding five cards numbered 1 through 5. He has asked five students to each
randomly pick a card to see how goes first in a game. Whoever picks the card numbered 5 goes
first. Juanita picks first, gets the card numbered 4, and keeps the card. What is the probability
that Yoko will get the card numbered 5 is she picks second?
a.
€
1
2
b.
€
Susan Mercer, Laura Westermeier, Ed.D.
Educational Services, SAUSD
1
3
c.
€
1
4
d.
1
5
€
Fall, 2007
Week 11 – Answer Key - Page 2 of 2