MAT 202 RANDOM VARIABLES CHECKPOINT 1 QUIZ (Straighterline)

RANDOM VARIABLES CHECKPOINT 1 Step 1 of 1 The first three questions refer to the following information: The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution: x 0 1 2 P(X=x) 0.20 0.30 0.20 Question 1 of 4 What is the probability that in a given week there will be at most 3 accidents? 0.70 0.85 0.35 0.15 1.00 Good job! P(X ≤ 3) = .20 + .30 + .20 + .15 = .85 or P(X ≤ 3) = 1 - P(X ≤ 4) = 1 - (.10 + .05) = 1 - .15 = .85 Question 2 of 4 By the third day of a particular week, 2 accidents have already occurred in the intersection. What is the probability that there will be less than a total of 4 accidents during that week? 1.00 0.90 0.85