An experiment is run as follows-the colors red, yellow, and blue are each flashed on a screen

Question:

An experiment is run as follows-the colors red, yellow, and blue are each flashed on a screen for a short period of time. A subject views the colors and is asked to choose the one he feels was flashed for the longest time. The experiment is repeated three times with the same subject.
a. If all the colors were flashed for the same length of time, find the probability for x, the number of times that the subject chose the color red. Assume that his three choices are independent.
b. Construct the probability histogram for the random variable x. Distribution
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