E-PolyLearning

41. The probability distribution of discrete random variable is classified as
a. probability mass function
b. posterior mass function
c. interior mass function
d. continuous mass function
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Answer: (a).probability mass function

42. The standard normal probability distribution has mean equal to 40, whereas the value of random variable x is 80 and the z-statistic is equal to 1.8 then the standard deviation of standard normal probability distribution is
a. 120
b. 80
c. 40
d. 20
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Answer: (d).20

43. In standard normal probability distribution, the z-score of distribution will be zero if
a. x < μ
b. x > μ
c. x = μ
d. all of above
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Answer: (c).x = μ

44. If the value of λ is 9 and value of random variable x is 5 then the value of z-score is
a. −2.58
b. −1.86
c. −2.34
d. −1.34
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Answer: (d).−1.34

45. The formula of calculating the expected value of random variable x of gamma distribution is as
a. E(x) = n ⁄ μ
b. E(x) = pq ⁄ μ
c. E(x) = μ ⁄ np
d. E(x) = α ⁄ μ
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Answer: (a).E(x) = n ⁄ μ