How many times must a man toss a fair com so that the probability of having at least one head is more than 90%?

How many xx must a man toss a fair com so that the probability of having at least one head is more than 90%?

How many xx must a man toss a fair coin, so that the probability of having at least one head is more than 80%?

How many xx must a man toss a fair coin so that the probability of having a least one head is more than 80%?

Consider the following statements I : An experiment succeeds twice as often as it fails. Then, the probability that in the next six trials, there will be atleast 4 successes is 31/9(2/3)^(4) II : The number of times must a man toss a fair coin so that the probability of having atleast one head is more than 90% is 4 or mor than 4.

The minimum number of times one has ot toss a fair coin so that the probability of observing atleast one head is atlest 90% is

The probability of a man hitting a target is 1/2. How many xx must he fire so that the probability of hitting the target at least once is more than 90% .

Minimum number of times a fair coin must be tossed so that the probility of gettig atleast one head is more than 99% is

A coin is tossed 3 times. The probability of obtaining at least 2 heads is

The probability of a shooter hitting a target is (3)/(4). How many minimum number of xx must he/she fire so that the probability of hitting the target at least once is more than 0.99?

A coin is tossed 6 times . Find the probability of getting at least 3 heads .