Question

Let says a coin is tossed 4 times, what is the probability of

getting exactly 2 heads? (Use binomial
distribution)

Answer 1

Related Concepts

• binomial distribution

Solution

Let X be the event of getting a head.

Thus, X ~ B(4, 1/2)

Solving using GDC:

binompdf(4, 1/2, 2)

= 0.375

Therefore, the probability of getting exactly 2 heads is 0.375.