43 divided by 50 equals to 0.86
Probability of heads or tails is .5
so you do (.5)^3 and you get D = 0.125
Answer:
The number of persons entering the bank based on given 20 simulations are 12
The number of persons exiting the bank based on given 20 simulations are 8
We have to find the probability that she will see a person entering the bank.
The probability that she will see a person entering the bank is:


Therefore, the option 0.600 is correct.
10xBx15+11xB is that what you are needing for the answer because you didn't really say what you where looking for.
C is the correct answer.<span />