Probability Unit Assignment
1. During a recent survey of ethnic backgrounds of 1000 people in a large city,
513 were Canada, 148 were French, 72 were African, 56 were Asian and the
remainder were from other groups
Calculate the probability that a person, selected at random from the population
has:
a.
a Canadian background?
b.
an African background?
c.
an “other” background?
First in order to do this question we need to find out this first:
Total number of people = 1000

Canadian= 513

French = 148

African = 72

Asian = 56
Other groups=1000 – (513+148+72+56) = 211
Probability =
numberof favorableoutcomes
Total number of possible outcomes
a.
P(Canadian Background) = 513/1000
=0.153
They are about 15.3% people chosen with a Canadian Background.
b.
P(African Background) = 72/1000
= 0.072
They are about 7.2% people chosen with a African Background.
c.
P(Other groups background) = 211/1000
=0.211
They are about 21.1% people chosen with an “other group background”.
2. A spinner is divided into three equally sized regions as shown. The spinner is
spun twice. For each probability you determine, express your answer as a
fraction, decimal and percent.
a.
What is the probability of spinning A on the first spin?
b.
Draw a tree diagram to represent the sample space for both spins.
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 Spring '17
 Dice, Threepoint field goal, African Background, ncx p, Probability Unit Assignment, Canadian Background