Use the Data Given Below to Answer the Following Questions)

Use the data given below to answer the following questions) .
On an average, the number of students that choose to study Arts subjects at Greyin Tide University is 17 each year. Hint: Use Poisson distribution formula) .
-Which of the following is true about probability density functions?

A) A graph of the density function must lie at or below the x-axis.
B) The total area under the density function below the x-axis is 2.0.
C) It calculates the probability of a random variable lying within a certain interval.
D) P (a) x P (b) is the area under the density function between two numbers a and b.