Suppose that there are 40 students in a statistics class and their blood type follows the percentage

Question:

Suppose that there are 40 students in a statistics class and their blood type follows the percentage given in Exercise 2.4.26.
(a) If we randomly select two students from this class, what is the probability that both will have the same blood type?
(b) If we randomly select two students from this class and it is observed that the first student’s blood type is B+, what is the probability that the second student’s blood type is O+?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...