genetics coin flip

Question

You flip a coin six times and four of those are "heads." Using the binomial probability distribution formula, determine the probability of getting "heads" four of the six times. Reminder: You may use a calculator for recitation quizzes. 

Group of answer choices

0.234

0.0625

0.3125

0.6667

Answer 1

The binomial coefficient formula is (n choose k)*((probability of heads)*(probability of tails))^6

since we only want to find the probability of exactly 4 heads and 2 tails then the formula becomes,

(6 choose 4) (0.5)^6 = 15*(1/64) = 0.234