Sam flips a coin 12 times. Find the probability that it comes up heads at least 10 times.
+1005 The probability of it being heads 10 times is (1/2)^10, and since we can have cases for 11 and 12, plus (1/2)^11 and (1/2)^12.
So the answer is most definitely not 10/12. An explanation would be helpful?
12! / [10! . 2!. 2^12] =0.01611328125
12! / [11! . 1!. 2^12] =0.0029296875
12! / [12! . 0!. 2^12] =0.000244140625
The probability of at least 10 heads:
Sum of above 3 =0.019287109375=1.93%, or:
79 / 2^12 =79 / 4096
