The time to failure (in hours) for a laser in a cytometry machine is modeled by an exponential distribution with λ = 0 00004. Find the probability that the laser will last at least 20000 hours | 0.45
The random Variable X has a binomial distribution with n=10 and p= 0.5. Which in the following statements is True? P(X=5) = 0.2461 , P (X <=2) = 0.0547 , P (X >=9) = 0.0107 | All of the them
A class in advanced physics is comprised of 10 juniors, 30 seniors and 10 graduate students. The final grades showed that 3 of the juniors , 10 of the seniors and 5 of the graduate students received an "A " for the course. If a student is chosen at random from this class and is found to have earned an A, What is the probability that he or she is a senior? | 5/9
n perfectly symmetrical distributions, which of the following is NOT a correct statement? | The distance from Q 1 is the same as the distance from Q 2 is half of the distance from the smallest to the largest observation.
You are dealt two cards successively (without replacement) from a shuffled deck of 52 playing cards. Find the probability that both cards are black. | 0.245
The age distribution of students at a community college is given below. Age (years) Number of students
Under 21 410 21-24 404 25-28 276 29-32 155 33-36 97 37-40 63 Over 40 86 A student from the community college is selected at random. Find the probability that the student is 25 years or over. Give your answer as a decimal rounded to three decimal places. | 0.454
