
Random Variables and Distributions
Authored by Anthony Clark
Mathematics
12th Grade

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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Binomial or Not Binomial?
Rolling a dice ten times and recording how many threes are rolled
Binomial
Not Binomial
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In a preliminary audition, 40% of the candidates qualified for the finals of a singing competition.
If a sample of 12 candidates is selected at random, find the probability that 8 candidates from the sample qualified for the finals. Which are the correct mathematic statement for the case above?
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Choose the correct sign
'probability between 4 and 9'
P(4<X<9)
P(4<X≤9)
P(4≤X≤9)
P(4≤X<9)
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
At a certain intersection, the light for eastbound traffic is red for 15 seconds, yellow for 5 seconds, and green for 30 seconds. Find the probability that out of the next eight eastbound cars that arrive randomly at the light,exactly three will be stopped by a red light.
0.254
0.147
0.027
0.1940
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The owner of a small convenience store is trying to decide whether to discontinue selling magazines. He suspects that only 5% of the customers buy a magazine and thinks that he might be able to use the display space to sell something more profitable. What is the probability that at least 5 of his first 50 customers buy magazines?
0.104
0.896
0.066
0.774
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What does the n stand for in the binomial probability formula?
Number of trials
Number of Successes
Probability of Successes
Probability of Failures
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What does the p stand for in the binomial probability formula?
Number of trials
Number of Successes
Probability of Successes
Probability of Failures
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