Mark (√) against the correct answer in each of the following:
A fair coin is tossed 6 times. What is the probability of getting at least 3 heads?
Using Bernoulli’s Trial P(Success=x) = nCx.px.q(n-x)
x=0, 1, 2, ………n and q = (1-p)
As the coin is thrown 6 times the total number of outcomes will be 
.
And we know that the favourable outcomes of getting at least 3 successes will be, getting a head
The probability of success is 
and of failure is also 
6C3(
)3(
)3 +6C4(
)4(
)2 +6C5 (
)5(
)1 + 6C6(
)6(
)0
⇒ 
1