Final answer:
The random variable X can take on different values and has a distribution denoted as X~. The probability of X being no less than a is represented by P(x ≥ a).
Step-by-step explanation:
a. X represents the random variable.
b. X can take on various values depending on the context of the problem.
c. The distribution of X, denoted as X~, refers to the probabilities associated with each possible value of X.
d. The probability that x is no less than a is represented by P(x ≥ a).