# Thread: Probability question- Help Im stuck

1. ## Probability question- Help Im stuck

Question:
A group of 100 people exhibited the following blood types:
A20 B24 AB10 O46
If one person is selected at random, what is the probability

A) The person has type AB blood?
My answer so far:P(type AB blood)=10/100=0.1 or 10%

B)the person has either type A or type O blood?
My answer so far: P(type A blood)=20 P(TYPE O blood)=46 =(20+46)/100=0.66

C) The person does not have type B blood?
I do not know where to start

D) The person has neither type B nor type O blood?

2. Originally Posted by sweetx
A) The person has type AB blood?
My answer so far:P(type AB blood)=10/100=0.1 or 10%
I agree.

Originally Posted by sweetx
B)the person has either type A or type O blood?
My answer so far: P(type A blood)=20 P(TYPE O blood)=46 =(20+46)/100=0.66
I agree as well.

Originally Posted by sweetx
C) The person does not have type B blood?
I do not know where to start
The probability that something is NOT the case is the probability for all cases minus the probability for that particular case. In other words, calculate the probability for blood type B first (like in question A) and subtract it from 1 (i.e. 100%).

Originally Posted by sweetx
D) The person has neither type B nor type O blood?
Just combine the steps of thought from question B and C to solve this problem.

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