What is the probability that a toss of four coins will yield

  What is the probability that a toss of four coins will yield at most two heads?

Include the formula that you used in Excel and the values that you entered to find your answer.^* Answer: 0.2424    =BINOM.DIST(6, 10, 0.64, FALSE)

Solution

This is binomial distribution.

At most 2 heads would be an x value of 2 or less.

Number of trials, n, is 4.

The probability, p, is = .5.

This would be true because it would be cumulative, x is less than or equal to 2.

The excel formula:

=BINOM.DIST(2,4,0.5,TRUE)

The answer is 0.6875.