Nursing school

The following table shows 1000 nursing school applicants classified according to scores made on a college entrance examination and the quality of the high school from which they graduated, as rated by a group of educators:  

Quality of High Schools Score Poor(P) Average(A) Superior(S) Total
Low(L) 105 60 55 220
Medium(M) 70 175 145 390
High(H) 25 65 300 390
Total 200 300 500 1000

Calculate the probability that the company will pick an applicant at random from this group:
a. Graduated from a superior high school.
b. Made a low score on the examination and graduated from a superior high school. c. Made a high score or graduated from a superior high school.

Correct answer:

p1 =  0

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