Let X denote the number of hours you study during a randomly selected school day. The probability that X can take the values x, has the following where k is come unknown constant.
What is the probability that you study at least two hours?
Answer & explanation
Correct answer: option 1
P(at least two hours) = P(X>=2)
P(X>=2) = P(X=2) + P(X=3) + P(X=4)
= 2k + 2k + k = 5k = 5(0.15)
= 0.75