Question
How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?
Solution
Let n be the number of times a fair coin is tossed.
Now
P(at least one head) > 90% (given)
∴ least value of n is 4
∴ minimum number of tosses is 4.
Now
P(at least one head) > 90% (given)
∴ least value of n is 4
∴ minimum number of tosses is 4.
