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Quantitative Aptitude

PROBABILITY MCQs

Probability, Probability I

Total Questions : 775 | Page 73 of 78 pages
Question 721. In special rule of addition of probability, the events are always
  1.    Bayesian
  2.    Empirical
  3.    Independent events
  4.    Mutually Exclusive events
 Discuss Question
Answer: Option D. -> Mutually Exclusive events
In special rule of addition of probability the events must be mutually exclusive.
Question 722. The variance of binomial distribution is always
  1.    Less than mean
  2.    Equal to mean
  3.    Greater than mean
  4.    Equal to standard deviation
 Discuss Question
Answer: Option A. -> Less than mean
The variance of binomial distribution is always Less than mean
Question 723. Which of the following is not a condition of the binomial distribution?
  1.    trials must be independent
  2.    must have at least 3 trials
  3.    only 2 possible outcomes
  4.    have constant probability of success
 Discuss Question
Answer: Option B. -> must have at least 3 trials
must have at least 3 trials
Question 724. In which approach to probability the outcomes are equally likely to occur?
  1.    Classical Probability
  2.    Subjective Probability
  3.    Relative Frequency
  4.    Independent
 Discuss Question
Answer: Option A. -> Classical Probability
In Classical probability the outcomes are equally likely to occur.
Question 725. Binomial distribution has parameters
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option B. -> 2
Binomial distribution has 2 parameters
Question 726. There are 49 cards in a box numbered from 1 to 49
  1.    2/49
  2.    3/49
  3.    4/49
  4.    5/49
 Discuss Question
Answer: Option B. -> 3/49
Question 727. A box contains 4 red, 5 green and 6 white balls
  1.    $$\frac{2}{5}$$
  2.    $$\frac{3}{5}$$
  3.    $$\frac{1}{5}$$
  4.    $$\frac{7}{15}$$
 Discuss Question
Answer: Option B. -> $$\frac{3}{5}$$
Question 728. A box contains 20 electric bulbs, out of which 4 are defective
  1.    $$\frac{4}{19}$$
  2.    $$\frac{7}{19}$$
  3.    $$\frac{12}{19}$$
  4.    $$\frac{21}{95}$$
 Discuss Question
Answer: Option B. -> $$\frac{7}{19}$$
Question 729. Two dice are tossed
  1.    1/6
  2.    5/12
  3.    1/2
  4.    7/9
 Discuss Question
Answer: Option B. -> 5/12
Question 730. An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles
  1.    $$\frac{{13}}{{35}}$$
  2.    $$\frac{{1}}{{5}}$$
  3.    $$\frac{{18}}{{455}}$$
  4.    $$\frac{{7}}{{15}}$$
 Discuss Question
Answer: Option C. -> $$\frac{{18}}{{455}}$$

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