Question Library
Browse our collection of questions across various subjects
Mathematics
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Let X be the set of all persons living in Delhi. The persons a and b in X are said…
NDA Mathematics 2015
NDA 2015
Mathematics
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Let the random variable X follow B(6, p). If 16 P(X = 4) = P(X = 2), then what is…
NDA Mathematics 2016
NDA 2016
Mathematics
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In a series of 3 one-day cricket matches between teams A and B of a college, the probability of team…
NDA Mathematics 2016
NDA 2016
Mathematics
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A coin is tossed three times. Consider the following events:A: No head appearsB: Exactly one head appearsC: At least two…
NDA Mathematics 2016
NDA 2016
Mathematics
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If the covariance between x and y is 30, variance of x is 25 and variance of y is 144,…
NDA Mathematics 2016
NDA 2016
Mathematics
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A random sample of 20 people is classified in the following table according to their ages: Age: 15–25 | Frequency:…
NDA Mathematics 2016
NDA 2016
Mathematics
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Two variates x and y are uncorrelated and have standard deviations σx and σy respectively. What is the correlation coefficient…
NDA Mathematics 2016
NDA 2016
Mathematics
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Three independent events A1, A2 and A3 occur with probabilities P(Ai) = 1/(i+1), i = 1,2,3. What is the probability…
NDA Mathematics 2016
NDA 2016
Mathematics
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A machine has three parts, A, B and C, whose chances of being defective are 0.02, 0.10 and 0.05 respectively.…
NDA Mathematics 2016
NDA 2016
Mathematics
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For two events, A and B, it is given that P(A) = 3/5, P(B) = 3/10 and P(A|B) = 2/3.…
NDA Mathematics 2016
NDA 2016
Mathematics
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A medicine is known to be 75% effective to cure a patient. If the medicine is given to 5 patients,…
NDA Mathematics 2016
NDA 2016
Mathematics
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Consider the following statements in respect of class intervals of grouped frequency distribution: 1.Class intervals need not be mutually exclusive.…
NDA Mathematics 2016
NDA 2016
Mathematics
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In a study of two groups, the following results were obtained: Group A: Sample size = 20, Sample mean =…
NDA Mathematics 2016
NDA 2016
Mathematics
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For 10 observations on price (x) and supply (y), the following data was obtained:Σx = 130, Σy = 220, Σx^2…
NDA Mathematics 2016
NDA 2016
Mathematics
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The scores of 15 students in an examination were recorded as: 10, 5, 8, 16, 18, 20, 8, 10, 16,…
NDA Mathematics 2016
NDA 2016
Mathematics
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Consider the following statements: 1.The mean and median are equal in symmetric distribution. 2.The range is the difference between the…
NDA Mathematics 2016
NDA 2016
Mathematics
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Three candidates solve a question. Odds in favour of the correct answer are 5:2, 4:3 and 3:4 respectively for the…
NDA Mathematics 2016
NDA 2016
Mathematics
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A student appears for tests I, II and III. The student is considered successful if he passes in tests I,…
NDA Mathematics 2016
NDA 2016
Mathematics
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A salesman has a 70% chance to sell a product to any customer. The behaviour of successive customers is independent.…
NDA Mathematics 2016
NDA 2016
Mathematics
Easy
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There is 25% chance that it rains on any particular day. What is the probability that there is at least…
NDA Mathematics 2016
NDA 2016