You throw a coin 5 times. What is the probability that the coin will land heads exactly 3 times? What is the probability that the coin willl land heads the first and last time?

Question

amistre64 · Answer

since the probability of a fair coin is 1/2 for either side:  this simplifies to the number of times you can get 3  out of 5, time (1/2)^5

amistre64 · Answer

since there is only 1 way to get the second option:  its just 1 out of all the difference events

amistre64 · Answer

which i want to say simplifies to (1/2)^5