Let x be the number of potential weapons detected by a metal detector at an airport on a given day. The following table lists the probability distribution of x. 2 3 5 P(x) 0.14 0.13 0.18 0.23 0.14 0.18 Calculate the mean and standard deviation for this probability distribution. Round your answers to three decimal places. mean= i standard deviation= i

Show how to find the mean and standard deviation of the following probability distribution.  Round all answers to 4 decimal places.   X -3 -2 0 2 3 P(X) 0.1 0.3 0.2 0.1 0.3   Mean _______________       Standard deviation _______________

Find the standard deviation of this probability distribution. Give your answer to at least 2 decimal places

Calculate the mean and standard deviation for the discrete probability distribution shown here. Mean = Don't round. SD = Round to thousandths place.

Calculate the standard deviation ? of X for the probability distribution. (Round your answer to two decimal places.) x 0 1 2 3 P(X = x) 0.1 0.3 0.4 0.2 ? =

Find the mean, variance and standard deviation for the probability distribution given below:   X -5 2 12 10 P(X) 0.553 0.136 0.213 0.098

A professor knows that her statistics students' final exam scores have a mean of 80 and a standard deviation of 12.2. In her class, an "A" is any exam score of 90 or higher. This quarter she has 25 students in her class. What is the probability that 7 students or more will score an "A" on the final exam?Hint: You will need to use your knowledge of normal probability distributions to determine the probability of one individual getting an A and then use your knowledge of binomial distributions to determine the probability of 7 students or more out of 25 students getting an A.prob = ____________Report your final answer accurate to 4 decimal places. Do not round any of the numbers in this calculation until the very end of the problem!

The average student loan debt for college graduates is $25,850. Suppose that that distribution is normal and that the standard deviation is $14,000. Let X = the student loan debt of a randomly selected college graduate. Round all probabilities to 4 decimal places and all dollar answers to the nearest dollar. %3D a. What is the distribution of X? X N( b Find the probability that the college graduate has between $21,400 and $34,250 in student loan debt. c. The middle 10% of college graduates' loan debt lies between what two numbers? Low: $ High: $

P(x) 0.1 6 0.2 9. 0.1 11 0.6 Find the mean and standard deviation of this probability distribution. Give your answer to at least 2 decimal places. Mean: Standard Deviation:

find the standard deviation of this probability distribution. give your answer to 2 decimal places. x 0,1,2,3 p(x) 0.15,0.3,0.05,0.5