1.2. Independent Events and Sample Spaces http://www.ck12.org
Probabilities:P(female) =80
164
↙ 164 total studentsP(female) =20
41
P(going to university) =71
164
P(female)×P(going to university) =20
41
×
71
164
=
1420
6724
=
355
1681
= 0. 211
Therefore, there is a 21.1% probability that the first person chooses a student who is female and the second person
chooses a student who is going to university.
Guided Practice
2 cards are chosen from a deck of cards. The first card is replaced before choosing the second card. What is the
probability that they both will be sevens?
Answer:
LetA= 1 stseven chosen.
LetB= 2 ndseven chosen.
A little note about a deck of cards
A deck of cards consists of 52 cards.
Each deck has 4 parts (suits) with 13 cards in them.
Each suit has 3 face cards.