# Math221 Week 5 Quiz

Pages: 5 (1113 words) Published: March 13, 2013
Week 5 quiz math221on statistics
1. Question:
(TCO 4) How many ways can an EMT union committee of 5 be chosen from 25 EMTs?   Your Answer:
| | 100| |    |
| | 125| |    |
| | 15,504| |    |
| | 53,130|  ( Ch 4: Order does not matter: 25C5 = 53,130 ) |    CORRECT|   Points Received: 5 of 5 2. Question:
(TCO 4) Which of the following cannot be a probability?
| | 1| |    |
| | 85%| |    |
| | 0.425| |    |
| | 4/3|  ( Ch 3: 4/3 = 1.333… cannot be a probability because probabilities are always between 0 and 1 inclusive ) |    CORRECT|   Points Received: 5 of 5 3. Question:
(TCO 4) List the sample space for dealing only clubs from a deck of cards.   Your Answer:
| | {A, 1, 2, 3, 4, 5, 6, 7, 8, 9, J, Q, K}|  ( Ch 3 ) |    |         | | {A, 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K}| |    CORRECT|         | | {A, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K}| |    |         | | { 1, 2, 3, 4, 5, 6, 7, 8, 9, J, Q, K}| |    |   Points Received: 5 of 5 4. Question:

(TCO 4) What is the probability of choosing a queen on the 2nd draw if the first was a queen (without replacement)?   Your Answer:
| | 0.077| |    |
| | 0.041| |    |
| | 0.059|  ( Ch 3: 3/51 ) |    CORRECT|         | | 0.023| |    |
Points Received: 5 of 5 5. Question:
(TCO 4) A respiratory class has 33 women and 18 men. If a student is chosen randomly to be the team leader, what is the probability the student is a woman?   Your Answer:
| | 0.33| |    |
| | 0.353| |    |
| | 0.67| |    |
| | 0.647|  ( Ch 3: 33/51 = 0.647 ) |    CORRECT|   Points Received: 5 of 5 6. Question:
(TCO 4) Compute the following: 3! ÷ (0! * 3!)
| | 6| |    |
| | 1|  ( Chapter 4 ) |    CORRECT|         | | 12| |    |
| | 0| |    |
Points Received: 5 of 5 7. Question:
(TCO 5) Decide whether the experiment is a binomial, Poisson, or neither based on the information given. A car towing service company averages two calls per hour. We’re interested in knowing the probability that in a randomly selected hour they will receive a call.   Your Answer:

| | binomial| |    |
| | Poisson|  ( Ch 4 ) |    CORRECT|         | | neither| |    |
Points Received: 5 of 5 8. Question:
(TCO 5) Given a Poisson distribution with mean = 4. Find P(X > 3).   Your Answer:
| | 0.195| |    |
| | 0.238| |    |
| | 0.433| |    |
| | 0.567|  ( Chapter 4 ) |    CORRECT|   Points Received: 5 of 5 9. Question:
(TCO 5) Given the random variable X = {5, 6} with P(5) = 0.2 and P(6) = 0.8. Find E(X).   Your Answer:
| | 5.8|  ( Chapter 4: E(X) = sum of (X * P(X)) ) |    CORRECT ANSWER|         | | 1.8| |    INCORRECT|
| | 4.8| |    |
| | 6.2| |    |
Points Received: 0 of 5 10. Question:
(TCO 5) If X = {10, 20, 30, 40} and P(10) = 0.30, P(20) = 0.30, P(30) = 0.30, and P(40) = 0.30, can distribution of the random variable X be considered a probability distribution?   Your Answer:
| | yes| |    |
| | no|  ( Chapter 4: sum of the probabilities is not equal to 1 ) |    CORRECT ANSWER|   Points Received: (not graded) 11. Question:
(TCO 5) If X = {1, 2, 3, 4, 5, 6} and P(1) = 0.3, P(2) = 0.2, P(3) = 0.1, P(4) = 0.1, P(5) = 0.1, and P(6) = 0.3, can distribution of the random variable X be considered a probability distribution?   Your Answer:

| | yes| |    |
| | no|  ( Chapter 4: sum of the probabilities is not equal to 1 ) |    CORRECT|   Points Received: 5 of 5 12. Question:
(TCO 5) The weight of a box of Cheerios represents what kind of distribution?   Your Answer:...