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Quantitative Aptitude

PROBABILITY MCQs

Probability, Probability I

Total Questions : 775 | Page 74 of 78 pages
Question 731. An urn contains 6 red, 4 blue, 2 green 3 yellow marbles
  1.    $$\frac{1}{6}$$
  2.    $$\frac{1}{7}$$
  3.    $$\frac{2}{15}$$
  4.    $$\frac{2}{5}$$
 Discuss Question
Answer: Option B. -> $$\frac{1}{7}$$
Question 732. If x is chosen at random from the set {1,2,3,4} and y is to be chosen at random from the set {5,6,7}, what is the probability that xy will be even?
  1.    1/2
  2.    2/3
  3.    3/4
  4.    4/3
 Discuss Question
Answer: Option B. -> 2/3
Question 733. X attempts 94 questions and gets 141 marks
  1.    45
  2.    47
  3.    57
  4.    40
 Discuss Question
Answer: Option B. -> 47
Question 734. If the standard deviation of a population is 6
  1.    40.25
  2.    42.25
  3.    18.25
  4.    13
 Discuss Question
Answer: Option B. -> 42.25
Question 735. If the standard deviation of a population is 7, what would be the population variance?
  1.    14
  2.    21
  3.    49
  4.    28
 Discuss Question
Answer: Option C. -> 49
Question 736. The variance of a set of data is 121
  1.    +-11
  2.    11
  3.    21
  4.    60.5
 Discuss Question
Answer: Option B. -> 11
Question 737. The mean of the data 2, 9, 9, 3, 6, 9, 4 is
  1.    33/7
  2.    6
  3.    43/7
  4.    7
 Discuss Question
Answer: Option B. -> 6
Question 738. The mean of a distribution is 15 and the standard deviation is 5
  1.    16.66%
  2.    66.66%
  3.    33.33%
  4.    100%
 Discuss Question
Answer: Option C. -> 33.33%
Question 739. If the standard deviation of a population is 10, what would be the population variance?
  1.    100
  2.    30
  3.    5
  4.    20
 Discuss Question
Answer: Option A. -> 100
Question 740. The mean of 20 observations is 19
  1.    20
  2.    30
  3.    40
  4.    42
 Discuss Question
Answer: Option C. -> 40

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