Calculating probability of specified events.
A study was made to examine the number of times adult males over 30 visit a physician each year. The results for an illustration of 300 were:
Number of visits

Number of adult males


0

30


1

60


2

90


3 or more

120



300

total

a) Determine what is the probability of selecting someone who visits a physician twice a year?
b) Determine what is the probability of selecting someone who visits a physical?