The time between arrivals of vehicles at a particular intersection follows an exponential probability distribution with a mean of 12 seconds. What is the probability that the arrival time between vehicles is 12 seconds or less? a) 0.43 b) None of the answers are correct c) 0.53 d) 0.63 e) 0.33

Suppose students' exam scores are normally distributed with mean u = 65 and standard deviation O = =10 What proportion of the students taking the test score at most 80? O a) 0.07 O b) 0.95 O c) 0.14 d) 0.93 e) 0.99

A random variable follows a binomial distribution with the probability of success for one trial at 0.83 and 17 randomly selected trials. Round to the fourth. a) Find the mean of the distribution. b) Find the standard deviation of the distribution c) Find the probability of exactly 12 successes. d) Find the probability of exactly 9 successes. e) Find the probability of exactly 7 successes

Determine whether the value is a discrete random variable, continuous random variable, or not a random variable. a. The time required to download a file from the Internet b. The height of a randomly selected giraffe c. The eye color of people on commercial aircraft flights d. The number of free-throw attempts before the first shot is made e. The amount of rain in City B during April f. The number of hits to a website in a day a. Is the time required to download a file from the Internet a discrete random variable, a continuous random variable, or not a random variable? A. It is a discrete random variable. B. It is a continuous random variable. C. It is not a random variable. b. Is the height of a randomly selected giraffe a discrete random variable, a continuous random variable, or not a random variable? A. It is a discrete random variable. B. It is a continuous random variable. C. It is not a random variable c. Is the eye color of people on commercial aircraft flights a discrete random…