A fair coin is tossed in the air ten times. What is the probability that it will land heads exactly nine times? Give your answer as a fraction in reduced form.
A) 1023/1024
B) 9/10
C) 5/512
D) 3/5
E) None of the above.

Question

Quizplus · Accepted Answer

The probability of getting heads in a single toss is 1/2. The probability of getting exactly 9 heads in 10 tosses is given by the binomial probability formula: C(10,9) * (1/2)^9 * (1/2)^1 = 10 * (1/2)^10 = 10/1024 = 5/512.

A Fair Coin Is Tossed in the Air Ten Times