What is 50 percent of 84

In order to find out 50% of 84. You take 84 and multiply it by .50 and then the answer ris 42.

the expected value of Tom's payoff is m²

Step-by-step explanation:

Given the data in the question,

E[x] = mp                                        

where p = 1/2

Now Tom gets payoff pounds until a tail first appears = 2m pounds

so

E[x] = m × 1/2 × 2m

E[x] = m²

Therefore the expected value of Tom's payoff is m²