Mark (√) against the correct answer in each of the following:
8 coins are tossed simultaneously. The probability of getting at least 6 heads is
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 tossed 8 times the total number of outcomes will be 
.
And we know that the favourable outcomes of getting at least 6 heads are,successes will be, getting a head,
The probability of success is 
and of failure is also 
the probability of getting at least 6 heads is =
P(6) +P(7) +P(8)
= 8C6(
)6(
)2 +8C7(
)7(
)1 +8C8(
)8(
)0
⇒ 
1