Question

A fair coin is tossed 5 times in a row. The exact probability of the coin landing heads exactly 2 times is?

in fractions please

Answer 1

the coin has to sides, so there are 2 possible choices given each of the 5 times. 2(5)=10. then, you divide 2 by that number (2/10), which is equal to 1/5

Answer 2

We can do this using the binomial probability distribution:

5C2 * (1/2)^2 * (1/2)^3 = 10 * 1/32

= 5/16