1
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?
A
0.16
B
0.48
C
0.58
D
0.98
2
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?
A
{H}
B
{TH}
C
{T, HT, HHT, HHHT, ...........}
D
{H, TH, TTH, TTTH, .............}
3
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?
A
75 and 75
B
50 and 100
C
70 and 80
D
100 and 50
4
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If a fair die is rolled 4 times, then what is the probability that there are exactly 2 sixes ?
A
$${5 \over {216}}$$
B
$${25 \over {216}}$$
C
$${125 \over {216}}$$
D
$${175 \over {216}}$$
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