E-PolyLearning

1. In binomial probability distribution, the dependents of standard deviations must includes
a. probability of q
b. probability of p
c. trials
d. all of above
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Answer: (d).all of above

2. The formula to calculate standardized normal random variable is
a. x - μ ⁄ σ
b. x + μ ⁄ σ
c. x - σ ⁄ μ
d. x + σ ⁄ μ
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Answer: (a).x - μ ⁄ σ

3. In random experiment, the observations of random variable are classified as
a. events
b. composition
c. trials
d. functions
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Answer: (c).trials

4. In binomial distribution, the formula of calculating standard deviation is
a. square root of p
b. square root of pq
c. square root of npq
d. square root of np
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Answer: (c).square root of npq

5. The variance of random variable x of gamma distribution can be calculated as
a. Var(x) = n + 2 ⁄ μ²;
b. Var(x) = n ⁄ μ²;
c. Var (x) = n * 2 ⁄ μ²;
d. Var(x) = n - 2 ⁄ μ³;
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Answer: (b).Var(x) = n ⁄ μ²;

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