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Determine whether the value is a discrete random variable, continuous random variable, or not a random variable.
a. The number of statistics students now reading a book
b. The number of people with blood type $A$ in a random sample of 50 people
c. The gender of college students
d. The height of a randomly selected giraffe
e. The number of fish caught during a fishing tournament
f. The amount of rain in City $B$ during April
a. Is the number of statistics students now reading a book a discrete random variable, a continuous random variable, or not a random variable?
A. It is a continuous random variable.
B. It is a discrete random variable.
C. It is not a random variable.
b. Is the number of people with blood type A in a random sample of 50 people a discrete random variable, a continuous random variable, or not a random variable?
A. It is a discrete random variable.
B. It is a continuous random variable.
C. It is not a random variable

Step 1 ：The question is asking to determine whether the given values are discrete random variables, continuous random variables, or not a random variable. A random variable is a variable whose possible values are numerical outcomes of a random phenomenon. There are two types of random variables, discrete and continuous.

Step 2 ：A discrete random variable is one which may take on only a countable number of distinct values such as 0,1,2,3,4,........ Discrete random variables are usually (but not necessarily) counts. If a random variable can take only a finite number of distinct values, then it must be discrete. Examples of discrete random variables include the number of children in a family, the Friday night attendance at a cinema, the number of patients in a doctor's surgery, the number of defective light bulbs in a box of ten.

Step 3 ：A continuous random variable is one which takes an infinite number of possible values. Continuous random variables are usually measurements. Examples include height, weight, the amount of sugar in an orange, the time required to run a mile.

Step 4 ：The number of statistics students now reading a book: This is a countable number, so it is a discrete random variable.

Step 5 ：The number of people with blood type A in a random sample of 50 people: This is also a countable number, so it is a discrete random variable.

Step 6 ：Final Answer: The number of statistics students now reading a book is a \(\boxed{\text{discrete random variable}}\).

Step 7 ：Final Answer: The number of people with blood type A in a random sample of 50 people is a \(\boxed{\text{discrete random variable}}\).