00:01
In this case, dermatologists are denoted as a d, which are 4, surgeons are denoted as s, which are 7, general practitioners are denoted as g and the count is 5, psychiatrists are denoted as a p and the count is 3, orthopedic specialist is denoted as o and the count is 3.
00:21
Therefore, the total number of doctors in this study is equal to 4 plus 7 plus 5 plus 3 plus 3 which is equals to 22.
00:34
We know that probability of occurrence of event is equal to number of favorable cases divided by total number of outcomes.
00:42
Here, if a doctor is selected at a random, in the a part, we have to obtain the probability that a psychiatrist, surgeon or dermatologist, that is desired probability is equal to probability of psychiatricks, that is p plus p of s plus p of d, which is equal to by the definition of probability, this probability is equal to 3 by 22 plus 7 by 22 plus 4 by 22, which is equal to 14 divided by 22, which is equal to 14 divided by which is equal to 0 .664.
01:32
Therefore, the answer for a part is 0 .664.
01:37
In the b part, we have to obtain the probability that a general physician or a surgeon, that is, probability of g plus probability of s, that is surgeon, which is equals to 5 by 22 plus 7 by 20...