Summative Test No. 4 (Probability of Union of Two Events)
Quiz by Miguela Cagampang
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- Q1
When does the union of two events occur?
Event A and event B are mutually exclusive.
Both event A and event B occur.
Either event A or event B occurs.
Neither event A and event B occur.
30s - Q2
What do you call the collection of all outcomes that is an element of one or the other of the sets A and B, or both of them?
Complement.
Intersection.
Union.
Condition.
30s - Q3
In the formula for finding the probability of a union of two events:
P (A ∪ B) = P (A) + P (B) - P (A ∩ B) subtracted from P (A) + P (B)?
This rule determines the probability of event A or B occurring, not A and B, so this factor is subtracted.
Either A or C.
P (A ∩ B) has been counted twice through P (A) and P (B).
There is no explanation other than it's just a part of the rule.
30s - Q4
From a deck of 52 cards, what is the probability of drawing a number card or a spade?
10/13
49/52
40
49
30s - Q5
Two dice are tossed at the same time, what is the probability of getting a sum greater than 10?
3
1/12
1/13
1/3
30s - Q6
Fifteen balls in a jar are numbered from 1 to 15. A ball is drawn at random. What is the probability that the number on the ball is less than 6 or even.
5/15
2/3
2/15
7/15
30s - Q7
What is P (A ∩ B) if P (A) = 0.65, P (B) = 0.30 and P (A ∪ B) = 0.75?
0.65
0.30
0.20
0.15
30s - Q8
Mang Pepito has a farm with chickens and pigs. 27% are chickens and 39% are pigs. What is the probability that an animal chosen in random is either a chicken or a pig?
0.12
0.73
0.39
0.66
30s - Q9
In a class of 29 students, 15 like Science and 21 like Math. They all like at least 1 of the two subjects. What is the probability that a student chosen in random likes Math or Science?
1
15/29
14/29
7/29
30s - Q10
The result of a survey about student’s favorite tv network is shown below.
12/25
31/100
17/100
31/50
30s
