Help me answer this question below in description

Question

Assume that a procedure yields a binomial distribution with

nequals=4

trials and a probability of success of

pequals=0.50.

Use a binomial probability table to find the probability that the number of successes x is exactly

1.

Answer 1

(4 choose 1) (0.5)^1 ( 0.5)^3 =

4 * 0.5 * 0.5^3 =

4 ( 0.5^4) =

4/16 = 1/4 = 0.25 = 25%

Answer 2

Are you having trouble figuring out how to put this into the formula?

p = 0.50

n = 4

x = 1

q = 1 - p = 0.50

P(X = 1) = 4! / (4-1)!1! * 4¹ * (0.5)^4-1