# 46n 12 x 5 p 025 a0027 b0103 c0091 d0082 47n 9 x 8 p

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Chapter 3 / Exercise 3.2
Introductory Econometrics: A Modern Approach
Wooldridge
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46)n =12, x =5, p =0.25A)0.027B)0.103C)0.091D)0.08247)n =9, x =8 , p =0.5A)0.0176B)0.0039C)0.0229D)0.0264Find the indicated probability.48)A test consists of 10 true/false questions. To pass the test a student must answer at least 7 questions correctly. Ifa student guesses on each question, what is the probability that the student will pass the test?A)0.117B)0.055C)0.172D)0.94549)A machine has 7 identical components which function independently. The probability that a component willfail is 0.2. The machine will stop working if more than three components fail. Find the probability that themachine will be working.A)0.967B)0.029C)0.033D)0.99650)In a certain college, 33% of the physics majors belong to ethnic minorities. If 10 students are selected at randomfrom the physics majors, that is the probability that no more than 6 belong to an ethnic minority?A)0.9815B)0.0547C)0.913D)0.9846Find the mean, μ, for the binomial distribution which has the stated values of n and p. Round answer to the nearest tenth.51)n =41; p =.2A)μ=8.5B)μ=8.2C)μ=7.7D)μ=8.9Find the standard deviation, σ, for the binomial distribution which has the stated values of n and p. Round your answerto the nearest hundredth.52)n =47; p =.2A)σ=6.01B)σ=2.74C)σ=0.33D)σ=6.86Solve the problem.53)According to a college survey, 22% of all students work full time. Find the standard deviation for the number ofstudents who work full time in samples of size 16.A)1.66B)1.88C)3.52D)2.7554)A die is rolled 24 times and the number of twos that come up is tallied. If this experiment is repeated manytimes, find the standard deviation for the number of twos.A)1.833B)1.826C)1.787D)2.4555)In a certain town, 50% of voters favor a given ballot measure. For groups of 40 voters, find the variance for thenumber who favor the measure.A)3.16B)20.00C)100.00D)10.008
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Chapter 3 / Exercise 3.2
Introductory Econometrics: A Modern Approach
Wooldridge
Expert Verified
56)In a survey, 20 people were asked how many magazines they had purchased during the previous year. Theresults are shown below. Construct a histogram to represent the data. Use 4 classes with a class width of 10, andbegin with a lower class limit of -0.5. What is the approximate amount at the center?6 15 3 36 25 18 12 18 5 3024 7 0 22 33 24 19 4 12 99
Answer KeyTestname: M 63 SU 09 MIDTERM 1.1- 5.4 REVIEW1)D2)C3)D4)A5)B6)A7)B8)D9)A10)A11)A12)C13)D14)A15)B16)A17)D18)A19)D20)C21)B22)B23)B24)D25)D26)C27)C28)A29)B30)B31)A32)C33)A34)C35)D36)C37)B38)D39)C40)B41)D42)D43)A44)C45)C46)B47)A48)C49)A50)A51)B10
Answer KeyTestname: M 63 SU 09 MIDTERM 1.1- 5.4 REVIEW52)B53)A54)B55)D56)The approximate amount at the center is 16 magazines.11
MATH 63 TRIOLAREVIEW for FINAL 1.1 -10.4; 11.3Instructor:G. CochranMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the questionUsing the following uniform density curve, answer the question.1)What is the probability that the random variable has a value greater than 4?A)0.500B)0.625C)0.450D)0.375Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution.