LMC Statistics Math 110 The next question asks you to calculate an expected value. We write the formula
for the expected value as X*P(X) or N*P, where X or N represents the total
number of people and P(X) or P represents the probability of the outcome.
3. People with type O-negative blood are universal donors (any patient can
receive a transfusion of O-negative blood). Only about 6.6% of the American
population has O-negative blood. If 270 unrelated people give blood in a certain
week, how many of these people do we expect to be universal donors? (Hint:
Remember to convert percent numbers to decimals before multiplying.)