Question

3. In order to get at least one head with probability greater than or equal to 0.9, the number of times a coin
needs to be tossed is
A. 4
B.3
c.5
D. None of these​

Answer 1

Answer:

The minimum number of times a fair coin needs to be tossed, so that the. play ... If a coin is tossed four times then the probability that head appears at least once. play ... If a coin is tossed 3 times find the probability that a) Head does not. play ... If an unbiased coin is tossed three times, what is the probability of getting more.

Answer 2

4 is the correct answer

Probability of getting atleast one head in n times

$= 1 - (\frac{1}{2})^{n} \geqslant 0.9$

$= (\frac{1}{2})^{n} \leqslant 0.1 \\ {2}^{n} \geqslant 10 \\ n > 4$

Hence least value of n=4

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