Explanation:
The definition of discrete variable is the one whose value is obtained by counting a particular quantity. While the definition of continuous variable is that the value is obtained by measuring a particular quantity.
So the following variable are :
a. The number of fish caught during a fishing tournament.
This is a discrete variable
b. The number of hits to a website in a day.
This is a discrete variable
c. The number of people with blood type Upper A in a random sample of 23 people.
This is a continuous variable
d. The exact time it takes to evaluate 27 plus 72.
This is a continuous variable
e. The number of textbook authors now sitting at a computer.
This is a discrete variable.