Question 3 (SO2, AC1) If you wanted to draw up a simulation exercise to investigate the effect of a new form of insulated ceiling and
range of the spread of a fire in a building, how would you go about selecting a simulation exercise> (Explain
you thinking briefly.)

With n tosses, there are a total of 2^n possible outcomes. We need 15 of theses to be heads.
Since the tosses are random, we want to count the ways to have exactly 15 of them being heads. That will be C(n,15) ways to pick which tosses are heads.
The probability will be given by:
C(n,15)/2^n=0.0148
At this point we use various values of n until we get the correct probability.
n=18⇒0.003112793
n=19⇒0.007392883
n=20⇒0.014785767
n=21⇒0.025875092

n=20