According to Survey of Graduate Science Engineering Students and Post doctorates, published by the U.S. National Science Foundation, the distribution of graduate science students in doctorate-granting institutions is as follows. Frequencies are in thousands. Note: Earth sciences include atmospheric and ocean sciences as well.
Field ________________________________ Frequency
Agricultural sciences .............................. 15.1
Biological sciences ................................ 69.7
Computer sciences ................................. 46.1
Earth sciences ........................................ 14.9
Mathematical sciences ........................... 22.0
Physical sciences .................................. 38.7
Psychology ........................................... 45.6
Social sciences ..................................... 97.2
A graduate science student who is attending a doctorate-granting institution is selected at random. Determine the probability that the field of the student obtained is
a. Psychology.
b. Physical or social science.
c. Not computer science.