
Purchased Gum

Kept the Money



Students Given Four Quarters

3333

1515


Students Given a $1 Bill

1717

3434


Let,
S = Event representing when student spend the money
M = Event representing when student kept the money
Q = Event representing when student was given four quarters
B = Event representing when student was given $1 Bill
Thus, we can reframe the table as shown;
 S  K  Total 
Q  33  15  48 
B  17  34  51 
Total  50  49  99 
From tha table we can calculate the shown probabilities ;
a. The probability of randomly selecting a student who spent the money, given that the student was given a $1 bill is given as;
P(SB)
which is the conditional probability.
Now lets apply the formula to calculate conditional probability and calculate P(SB...
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