Respuesta :

Answer:

[tex]\frac{3}{8}[/tex]

Step-by-step explanation:

There are a list of possible outcomes:

  • TTT  (1)
  • TTH   (2)
  • THT  (3)
  • THH  (4)
  • HHH   (5)
  • HHT  (6)
  • HTH   (7)
  • HTT   (8)

This represents 8 outcomes.

The only ones that have two tails are:

  • TTH   (1)
  • THT  (2)
  • HTT (3)

Because there are 3, this means that the probability in a fraction form of Brian getting exactly 2 tails is 3/8. P ( exactly 2 tails) = 3/8.