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MATH 221 Week 5 Quiz

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MATH 221 Week 5 Quiz

Question :

(TCO 4) Three members of a club will be selected to serve as officers. The first person selected will be president, the second person will be vice-president and the third will be secretary/treasurer. How many ways can these officers be selected if there are 30 club members?

	Student Answer:		24,360
			4060
			27000
			52360

Question :

(TCO 4) Which of the following cannot be a probability?

	Student Answer:		0
			-49
			0.001
			14% Type: ES

Question :

(TCO 4) List the sample space of rolling a 6 sided die.

	Student Answer:		{1, 3, 5}
			{1, 2, 4, 6}
			{1, 2, 3, 4, 5, 6}
			{2, 3, 4, 5, 6}

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Question :

(TCO 4) What is the probability of choosing a queen on the 2^nd draw if the first was a queen (without replacement)?

	Student Answer:		0.077
			0.041
			0.059
			0.023

Question :

(TCO 4) A nursing class has 13 women and 18 men. If a student is chosen randomly to be the team leader, what is the probability the student is a woman?

	Student Answer:		0.419
			0.581
			0.333
			0.667

Question :

(TCO 4) Compute the following: 3! ÷ (0! * 3!)

	Student Answer:		6
			1
			12
			0

Question :

(TCO 5) Decide whether the experiment is a binomial, Poisson, or neither based on the information given. Each week a man plays a game in which he has a 21% chance of winning. The random variable is the number of times he wins in 64 weeks.

	Student Answer:		binomial
			Poisson
			neither

Question :

(TCO 5) Given a Poisson distribution with mean = 4. Find P(X < 3).

	Student Answer:		0.195
			0.238
			0.433
			0.567

Question :

(TCO 5) Given the random variable X = {7, 8} with P(7) = 0.7 and P(8) = 0.3. Find E(X).

	Student Answer:		4.9
			2.4
			2.5
			7.3

10.

Question :

(TCO 5) If X = {-1, 12, 3, -4} and P(-1) = 0.3, P(12) = 0.1, P(3) = 0.2, and P(-4) = 0.4, can distribution of the random variable X be considered a probability distribution?

	Student Answer:		yes
			no

11.

Question :

(TCO 5) If X = {2, 6, 10, 14} and P(2) = 0.2, P(6) = 0.3, P(10) = 0.4, and P(14) = 0.1, can distribution of the random variable X be considered a probability distribution?

	Student Answer:		yes
			no

12.

Question :

(TCO 5) The number of shoes in your closet represents what kind of distribution?

	Student Answer:		discrete
			continuous

13.

Question :

(TCO 5) Your baby’s height represents what kind of distribution?

	Student Answer:		discrete
			continuous

14.

Question :

(TCO 5) The amount of posts in our class at a given time represents what kind of distribution?

	Student Answer:		discrete
			continuous

Question :

(TCO 5) We have a binomial experiment with p = 0.4 and n = 2.

(1) Set up the probability distribution by showing all x values and their associated probabilities.

(2) Compute the mean, variance, and standard deviation.

Question :

(TCO 4) What is the probability that the student is a sophomore given he doesn’t carry a credit card?

Class	Credit Card Carrier	Not a Credit Card Carrier	Total
Freshman	33	27	60
Sophomore	6	34	40
Total	39	61	100

Question :

(TCO 4) Some students were asked if they carry a credit card. Here are the responses.

Class	Credit Card Carrier	Not a Credit Card Carrier	Total
Freshman	33	27	60
Sophomore	6	34	40
Total	39	61	100

What is the probability that the student didn’t carry a credit card?

Question :

(TCO 4) What is the probability that the student is a sophomore and doesn’t carry a credit card?

Class	Credit Card Carrier	Not a Credit Card Carrier	Total
Freshman	33	27	60
Sophomore	6	34	40
Total	39	61	100

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MATH 221 Week 5 Quiz

MATH 221 Week 5 Quiz

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