Blog

The lengths of a part is measured to the nearest tenth of a millimeter. The lengths are distributed uniformly with values at every tenth of a millimeter starting at 5.0 mm, 5.1 mm, and 5.2 mm. You may remember this as a homework problem.   This copywritten question is part of a quiz or exam at Arizona State.  It may not be posted on Chegg.com or any other website or reproduced without the permission of the author, Dr. L. Chattin, and Arizona State University.   The standard deviation of the length is ________ mm. Express your answer to four decimal places.

The number of surface flaws in plastic panels used in the interior of automobiles has a Poisson distribution with a population mean of 0.11 flaws in one square foot of plastic panel. This copywritten question is part of a quiz or exam at Arizona State.  It may not be posted to Chegg.com or any other website or reproduced without the permission of the author, Dr. L. Chattin, and Arizona State University. What is the population standard deviation of the number of flaws in 6.5 square feet of plastic panel? Express your answer to 4 decimal places.

Suppose you have rolled a fair die three time resulting in a face value of 1 on the first throw, a 5 on the second throw, and a 3 on the third throw?  This copywritten question is part of a quiz or exam at Arizona State.  It may not be posted on Chegg.com or any other website or reproduced without the permission of the author, Dr. L. Chattin, and Arizona State University.    Assuming that the throws are independent, what is the probability of rolling a face value of 2 on our 4th throw? Express your answer to four decimal places.

Fifteen samples of rejuvenated mitochondria are inspected to see if they have mutated or not. Historical data show that 2% of this type of mitochondria will have mutated.  This copywritten question is part of a quiz or exam at Arizona State.  It may not be posted on Chegg.com or any other website or reproduced without the permission of the author, Dr. L. Chattin, and Arizona State University.    If you wanted to determine the probability that three of these 15 have mutated, what would be the best definition of the random variable, X, that you would use?  X is _____________________________.

The largest value that a CDF can be is ___________. This question is copywritten by Arizona State University and Linda Chattin.  It may not be posted to any website, may not be texted to anyone, and may not be screenshot or photographed.  If your answer is non-integer, express it to four decimal places.

Twenty-two parts from a metal punching process are selected and inspected in sequence to determine if they pass or fail.  Typically, 3% of the parts fail.  This copywritten question is part of a quiz or exam at Arizona State.  It may not be posted on Chegg.com or any other website or reproduced without the permission of the author, Dr. L. Chattin, and Arizona State University.   The expected number of parts that do not fail is _________________. Exact answer please.

Suppose event A has probability 0.46 and event B has probability 0.78.  If A and B are independent, what is the probability that A and B occur? This copywritten question is part of a quiz or exam at Arizona State.  It may not be posted to Chegg.com or any other website or reproduced without the permission of the author, Dr. L. Chattin, and Arizona State University. .   Enter your answer to 4 decimal places. 

X is a normal random variable with mean equal to 6.7 and variance equal to 3.22.  This copywritten question is part of a quiz or exam at Arizona State.  It may not be posted on Chegg.com or any other website or reproduced without the permission of the author, Dr. L. Chattin, and Arizona State University.   Determine x such that P(X < x) = 0.12. Express your answer to four decimal places. 

An optical inspection system is used to distinguish among different part types. Parts are either passed or failed.  The probability of passing any part is 0.84. This copywritten question is part of a quiz or exam at Arizona State.  It may not be posted to Chegg.com or any other website or reproduced without the permission of the author, Dr. L. Chattin, and Arizona State University. Suppose that three parts are inspected and that the parts are independent. How many value can the random variable X assume?  

A computer network for a corporation is tracking the time between log-ins.  Analysts know that the time until the next log-in has the exponential pdf with