A) 5
B) 3
C) 2
D) 4
Correct Answer: D
Solution :
Probability of observing at least one head out of n tosses \[=1-{{\left( \frac{1}{2} \right)}^{n}}\ge 0.9\]\[\Rightarrow \]\[{{\left( \frac{1}{2} \right)}^{n}}\le 0.1\]\[\Rightarrow \]\[n\ge 4\] \[\Rightarrow \]minimum number of tosses = 4You need to login to perform this action.
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