I am having trouble with this problem:

The Red Cross anticipates the need for 2000 units of type O blood. If 6% of the population is type O and the Red Cross anticipates 40,000 donations this year,

a) what is the probability they will get at least 2000 units of type 0
b)what is the probability they will get between 3000 and 4000 units?

I calculated mu to be 2400 and sigma to be 47.5

For part a) I get a z score of -8.4. Do I interpret this to mean that 0% lies to the left, therefore 100% probability that they will receive 2000 or more units?

For part b) I get z scores of 33.7 and 12.6. These are so far out on the normal curve that 100% of the graph would lie to the left, meaning there is 0% chance of this happening.

Are these answers possible? Am I missing something?

Why did you now start another thread? You could have continues the thread you started before, where galactus already answered you.