The following frequency table shows the classification of 90 students in their sophomore year of college according to their understanding of physics, chemistry, and mathematics.

If a student is selected at random, find the probability that the student has

(a) an extensive understanding of chemistry;

(b) an extensive understanding of physics and an average understanding of mathematics and chemistry;

(c) an extensive understanding of any two subjects and an average understanding of the third;

(d) an extensive understanding of any one subject and an average knowledge of the other two.

Transcribed Image Text:

Physics Average Extensive Chemistry Chemistry Average Extensive Average Extensive Mathematics Average 8 16 12 18 Extensive 14 4 14 4