Quiz 7 (5.1/5.2)
Recently, the stock market took big swings up and down. A survey of 975 adult investors asked how often they tracked their portfolio. The table shows the investor responses. What is the probability that an adult investor tracks his or her portfolio daily? Express your answer as a simplified fraction and as a decimal rounded to three decimal places. How frequently? Response Daily 227 Weekly 284 Monthly 270 Couples times a year 141 Don't track 53 Total 975 A. 284/975; 0.291 B. 227/975; 0.233 C. 47/325; 0.145 D. 18/65; 0.277
227/975; 0.233
Use the spinner below to answer the question. Assume that it is equally probable that the pointer will land on any one of the five numbered spaces. If the pointer lands on a borderline, spin again. Find the probability that the arrow will land on an odd number. A. 1 B. 3/5 C. 0 D. 2/5
3/5
A die is rolled. The set of equally likely outcomes is {1,2,3,4,5,6}. Find the probability of getting a 7. A. 0 B. 7/6 C. 1 D. 7
A. 0
A probability experiment is conducted in which the sample space of the experiment is S={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}. Let event A={3,4,5,6} and event B={5, 6, 7, 8, 9}. Assume that each outcome is equally likely. List the outcomes in A or B. Find P(A or B). A. {3,4,5,6,7,8,9}; 7/15 B. {5,6}; 2/15 C. {3,4,5,6,8,9}; 2/5 D. {3,4,5,6,7,7,8,9}; 3/5
A. {3,4,5,6,7,8,9}; 7/15
The table lists the drinking habits of a group of college students. If a student is chosen at random, find the probability of getting someone who is a regular or heavy drinker. Round your answer to three decimal places. Sex Non-drinker Regular Drinker Heavy Drinker Total Man 135 66 5 206 Woman 187 21 14 222 Total 322 87 19 428 A.0.248 B.0.755 C.0.187 D.0.305
A.0.248
Which of the following cannot be the probability of an event? A. square root(3)/3 B. −9 C. 0 D. 0.001
B. -9
A die is rolled. The set of equally likely outcomes is {1,2,3,4,5,6}. Find the probability of getting a 3. A.3 B. 1/6 C. 1/2 D. 0
B. 1/6
The distribution of Bachelor's degrees conferred by a university is listed in the table. Assume that a student majors in only one subject. What is the probability that a randomly selected student with a Bachelor's degree majored in Physics or Philosophy? Round your answer to three decimal places. Major Frequency Physics 220 Philosophy 202 Engineering 86 Business 176 Chemistry 222 P (Physics or Philosophy) = A.0.243 B.0.466 C.0.223 D.0.534
B.0.466
The events A and B are mutually exclusive. If P(A)=0.8 and P(B)=0.1, what is P(A or B)? A. 0 B.0.08 C.0.9 D.0.7
C. 0.9
In 5-card poker, played with a standard 52-card deck, 2,598,960 different hands are possible. If there are 624 different ways a "four-of-a-kind" can be dealt, find the probability of not being dealt a "four-of-a-kind". Express the probability as a fraction, but do not simplify. A. 1248/2,598,960 B. 624/2,598,960 C. 2,598,336/2,598,960 D. 625/2,598,960
C.2,598,960 / 2,598,3362,598,960
The events A and B are mutually exclusive. If P(A)=0.1 and P(B)=0.1, what is P(A and B)? A. 0.5 B.0.2 C.0.01 D. 0
D. 0
Consider the data in the table shown which represents the marital status of males and females 18 years or older in a certain country for a certain year. Determine the probability that a randomly selected resident of the country 18 years or older is divorced or a male. Round to the nearest hundredth. Males Females Total (in millions) (in millions) (in millions) Never married 28.6 23.3 51.9 Married 62.1 62.8 124.9 Widowed 2.7 11.3 14.0 Divorced 9.0 12.7 21.7 Total (in millions) 102.4 110.1 212.5 A. 0.50 B. 0.58 C. 0.04 D. 0.54
D. 0.54
The following Venn diagram is for the six sample points possible when rolling a fair 6-sided die. Let A be the event rolling an even number and let B be the event rolling a number greater than 1. Which of the following events describes the event rolling a 1? A. A ∪ B B. B C. A ^ c D. B ^ c
D. B^ c
In the game of roulette in a certain country, a wheel has 38 slots — 18 slots are black, 18 slots are red, and 2 slots are green. A person watched a friend play roulette for two hours. In that time he noted that the wheel was spun 50 times and that out of those 50 spins black came up 22 times. Based on this data, the P(black)=22/50=0.44. This is an example of what type of probability? Observational Subjective Classical Empirical
Empirical
A(n) _______________ of a probability experiment is the collection of all outcomes possible. Bernoulli space Event set Sample space Prediction set
Sample space
Fill in the blank. The of an event A is the event that A does not occur. Venn diagram complement intersection union
complement
In terms of probability, a(n) ___________________ is any process with uncertain results that can be repeated. Experiment Outcome Sample space Event
experiment
true or false: The probability that event A will occur is P(A) = (Number of successful outcomes)/(Number of unsuccessful outcomes)
false
true or false: The probability of an event E in an empirical experiment may change from experiment to experiment.
true
