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Ms T's Probability Revision Quiz (thank you to Mr Walden at MAGS) Flashcards | StudBud
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Ms T's Probability Revision Quiz (thank you to Mr Walden at MAGS)
Ms T's Probability Revision Quiz (thank you to Mr Walden at MAGS)
18 terms
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StudBud Administration
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A revision quiz for NCEA Level 3 Probability
Flashcards
18 cards
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Practice quiz
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Host live
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Questions
18
Answers
1
The conditional probability formula is:
P(A|B)=P(AnB)/P(A)
P(B|A)=P(AnB)/P(B)
P(B|A)=(P(B)xP(A))/P(A)
P(A|B)=P(BnA)/P(B)
2
If P(A|B) = P(A) then:
P(A)+P(B)=P(AnB)
A and B are dependent events
A and B are independent events
A and B are complementary events
3
Three coins are flipped. What is the theoretical probability of getting two tails and one head?
none of the above
0.125
0.375
0.25
4
If P(A)+P(B) =1, we say events A and B are:
complementary events
events with probabilities that add to 1
mutually exclusive events
independent events
5
True or False?
False
True
6
The character(s) that belong in the intersection of "small" and "green" are:
Yoda and Kermit
Yoda, Hulk and Kermit
Gary Coleman
Yoda
7
10 people. 4 play only sport, 3 only play an instrument. 2 play neither. Which is incorrect?
P(sport) = 4/10
P(sport | instrument) = 1/4
P(sport U instrument) = 8/10
P(sport and instrument) = 1/10
8
Below are the results of a 2-question survey. Which of the following is incorrect?
P(V|U) = 42/70
P(V) = 42/150
U and V are not statistically independent
Number of people in the survey is 150
9
If P(AnB) = 0, we say events A and B are:
mutually independent events
independent events
complementary events
mutually exclusive events
10
P(pass|study) = 0.9. P(fail|don't study) = 0.6.Find the rel. risk of studying vs. not studying.
2.25
1.5
0.5
4/9
11
A calculator is used to generate a random
integer
between 45 and 77. What is P(number > 75)
2/32 = 1/16
2/33
2/31
1/32
12
A coin is flipped three times in a row. Which sequence is the most likely to occur?
they are all are equally likely
HTT
HHH
HTH
13
P(play sport) = 0.6, P(play music) = 0.3, P(play neither) = 0.2. What percentage play both?
0.2
0.1
Not enough information to answer
10
14
1000 people take a drug to lower their cholesterol. The drug reduces the risk of death by 22%.
This means 220 fewer people are expected to die
This means the drug prevents 22 people from dying
If 41 are expected to die, this will decrease by about 9
If 41 are expected to die, this will decrease to about 9
15
True or False?
True
False
16
Three coins are flipped. What is the true probability of getting two tails and one head?
0.125
0.375
None of the above
0.25
17
Out of 30 people, 14 play sport and 11 play an instrument. If 6 play both, how many do neither?
this situation is not possible
5
19
11
18
A and B are mutually exclusive events. P(A) = 0.4. P(B) = 0.3. What is P(A | B)?
1
0.4
0
0.12
