Kinh tế lượngTrắc nghiệm

500 câu trắc nghiệm Kinh tế lượng – 3B

11) A bin contains 78 light bulbs of which 4 are defective. If 5 light bulbs are randomly selected from the bin with replacement, find the probability that all the bulbs selected are good ones.
● 0.769
○ 0.779
○ 0
○ 0.949

12)The table below describes the smoking habits of a group of asthma sufferers.

Nonsmoker Light smoker Heavy smoker Total
Men 432 35 31 498
Women 438 39 43 520
Total 870 74 74 1018

If two different people are randomly selected from the 1018 subjects, find the probability that they are both heavy smokers.
● 0.005218
○ 0.0009273
○ 0.0001826
○ 0.005284

Provide a written description of the complement of the given event.
13) When 100 engines are shipped, all of them are free of defects.
○ All of the engines are defective.
● At least one of the engines is defective.
○ None of the engines are defective.

Find the indicated probability.
14) A sample of 4 different calculators is randomly selected from a group containing 12 that are defective and 40 that have no defects. What is the probability that at least one of the calculators is defective?
○ 0.338
○ 0.120
● 0.662
○ 0.650

Solve the problem.
15) In a certain lottery, five different numbers between 1 and 34 inclusive are drawn. These are the winning numbers. To win the lottery, a person must select the correct 5 numbers in the same order in which they were drawn. What is the probability of winning?

● 1/33,390,720
○ 1/ 120
○ 120/33,390,720
○ 1/34!
Find the indicated probability.

16) The table below shows the soft drinks preferences of people in three age groups.

cola root beer lemon-lime
under 21 years of age 40 25 20
between 21 and 40 35 20 30
over 40 years of age 20 30 35

If one of the 255 subjects is randomly selected, find the probability that the person drinks root beer given that they are over 40.

○ 2/5
○ 2/17
● 6/17
○ None of the above is correct.
17) The table below describes the smoking habits of a group of asthma sufferers.

Nonsmoker Light smoker Heavy smoker Total
Men 340 68 72 480
Women 305 90 80 475
Total 645 158 152 955

If one of the 955 subjects is randomly selected, find the probability that the person chosen is a woman given that the person is a light smoker.
● 0.570
○ 0.265
○ 0.189
○ 0.094

Solve the problem.
18) A firm uses trend projection and seasonal factors to simulate sales for a given time period. It assigns “0” if sales fall, “1” if sales are steady, “2” if sales rise moderately, and “3” if sales rise a lot. The simulator generates the following output.

0 1 0 2 2 0 0 1 2 0 2 0 2 0 2 2 1 2 0 1 2 2 2 0 3 0 0 2 1 2 1

Estimate the probability that sales will remain steady.

○ 0.125
○ 0.412
● 0.194
○ 0.258

Evaluate the expression.
19) 10P5
○ 252
○ 2
● 30,240
○ 5

Solve the problem.
20) The organizer of a television show must select 5 people to participate in the show. The participants will be selected from a list of 25 people who have written in to the show. If the participants are selected randomly, what is the probability that the 5 youngest people will be selected?
○ 1/120
● 1/53,130
○ 8/25
○ 1/6,375,600

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