Category: probability

Find the probability of correctly answering the first 5 questions on a multiple choice test if random guesses are made and each question has 3  possible answers.   Solution:-  

An antique table in value according to the function v(x) = 650(1.07)x dollars, where x is the number of years after 1980. A)     How much was the table worth in…

A random variable represents the number of successes in 30 Bernoulli trials, each with probability of success p =0.5. A)     Find the mean and standard deviation of the random variable.…

If a true-false test with 15 questions is given, what is the probability of scoring A)     Exactly 80% just by guessing? B)      80% or better by just guessing?   Solution:-…

If a baseball player has a batting average of 0.285, what is the probability that the player will get the following number of hits in the next four times at…

A fair die is rolled four times. What is the probability of obtaining at least three 6’s?   Solution:-   P(at least three 6’s) = .016  

A fair coin is tossed six times. What is the probability of obtaining at least five tails?   Solution:-   P(5 tails or more) =  

Is the selection a permutation, a combination, or neither? A mother order lunch (tuna, hamburger, or soup) for each of her 4 children.   Solution:-   The selection is neither…

  Is the selection a permutation, a combination, or neither? Alex picked 3 crayons from his crayon box to draw a picture.   Solution:-   The selection is a combination.…

Is the selection below a permutation, a combination, or neither? A president appoints 4 people to be the new president, vice-president, secretary, and treasurer.   Solution:-   The selection is…