Which of the following is always true for all probability density functions of continuous random variables?
A) They are symmetrical.
B) They are skewed to the right.
C) They are skewed to the left.
D) The area under the curve is 1.0.

Question

Quizplus · Accepted Answer

The area under the curve of a probability density function of a continuous random variable must be equal to 1, as the total probability of all possible outcomes is always 1. A, B, and C are incorrect because the symmetry or skewness of the probability density function depends on the specific distribution of the random variable and can vary.

Which of the Following Is Always True for All Probability