Blood group type alpha beta is found in only 5% of the population. Suppose 200 people are chosen at random, and their blood type is checked.
a) What is the mean µ and the standard deviation for this situation? Show your computations.
b) Sketch a normal curve and shade in the area that corresponds to 15 or more people having blood B. Shown the mean and standard deviation intervals on your sketch.
c) Out of those 200 people chosen at random, what is the probability that 15 or more will have group type alpha beta blood ? Show each step of your reasoning. Don't forget the continuity correction!