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Q 1/20
Score 0
30
Q 2/20
Score 0
30
20 questions
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1
30 sec
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2
30 sec
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3
30 sec
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4
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5
30 sec
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6
30 sec
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7
30 sec
Q.
A bag contains 4 red marbles and 6 blue marbles. If two marbles are drawn at random without replacement, what is the probability that both marbles are red?
8
30 sec
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9
30 sec
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10
30 sec
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11
30 sec
Q.
An urn contains 5 red balls and 3 blue balls. If two balls are drawn at random without replacement, what is the probability that both balls are red?
12
30 sec
Q.
Suppose a fair coin is flipped until the first head appears. What is the probability that the first head occurs on an even-numbered toss?
13
30 sec
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14
30 sec
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15
30 sec
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16
30 sec
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17
30 sec
Q.
Suppose a test for a disease has a sensitivity of 99% and a specificity of 95%. If the disease prevalence in the population is 2%, what is the probability that a person actually has the disease given that they tested positive?
