Final answer:
The random process x(t) = a cos(wt) is a Sinusoidal Process with a uniform distribution for the amplitude a.
Step-by-step explanation:
The random process x(t) = a cos(wt) is known as a Sinusoidal Process. This process involves a cosine wave with a frequency w, and the amplitude a is a random variable that is uniformly distributed.
a. The random variable X is the amplitude a of the cosine wave.
b. X~ represents that X is a random variable.
c. The probability distribution of X, which represents the amplitude a, would be a uniform distribution.
d. The distribution of the random variable X, which represents the amplitude a, is uniform.