NDA 2019 Paper 2 | Probability Question 71 | Mathematics

A bag contains 20 books out of which 5 are defective. If 3 of the books are selected at random and removed from the bag in succession without replacement, then what is the probability that all three books are defective?

0.009

0.016

0.026

0.047

NDA 2019 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

A coin is biased so that heads comes up thrice as likely as tails. For three independent tosses of a coin, what is the probability of getting at most two tails?

0.16

0.48

0.58

0.98

NDA 2019 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

If a coin is tossed till the first head appears, then what will be the sample space?

{H}

{TH}

{T, HT, HHT, HHHT, ...........}

{H, TH, TTH, TTTH, .............}

NDA 2019 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

The mean weight of 150 students in a certain class is 60 kg. The mean weight of boys is 70 kg and that of girls is 55 kg. What are the number of boys and girls respectively in the class?

75 and 75

50 and 100

70 and 80

100 and 50

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