Question

In: Statistics and Probability

1. (15pts) The length of time it takes to get through the security checks at a...

1. (15pts) The length of time it takes to get through the security checks at a very large urban airport is a random variable with mean μ = 20.6 minutes and standard deviation σ = 8.4 minutes. A simple random sample of 36 airline passengers is to be observed going through security.

̄

a) What is the sampling distribution of the sample mean X? (Specify the distribution,mean μX ̄ and standard deviation σX ̄ of the sampling distribution of X) (8pts)

(b) For the passengers in the SRS, what is the approximate probability that the mean length of time for them to get through security will be less than 15 minutes? (7pts)

Solutions

Expert Solution

We were unable to transcribe this image

POD page@ PC (-4) +382 contained gg.7% of t. values by 3 point W-32=-3 :P(-32143) = 0.997 :. P(Z2-4)=0 to poobability of the mean dength get secusity will be less than time for them is minuters is zero.


Related Solutions

“Design a video analytics system for security checks through video surveillance. Such a system demands real-time...
“Design a video analytics system for security checks through video surveillance. Such a system demands real-time response and accurate verification. With increasing use of high-definition cameras, your system should be able to transmit video surveillance data and track theft or criminals in real time. Describe how to use artificial intelligence and machine learning technology to analyze massive video files and automatically locate the suspects in a moving path based on target features”
*Generation time can best be defined as a. the length of time it takes for lag...
*Generation time can best be defined as a. the length of time it takes for lag phase b. the duration of log phase c. the time it takes for a cell to divide d. how many generations a cell can divide *Bacterial growth is usually graphed using ________. a. an arithmetic plot. b. a hyperbolic plot. c. a semi-logarithmic plot. d. an inverse plot. *Most bacteria reproduce by a. aerial hyphae. b. fragmentation. c. mitosis. d. binary fission. e. budding....
In a study of the length of time it takes to earn an associate’s degree, a...
In a study of the length of time it takes to earn an associate’s degree, a random sample of 41 students had a mean of 2.8 years. Assume that the population standard deviation is 0.9 years. You wish to construct a 99% confidence interval for the mean time it takes to earn an associate's degree. Use this information to answer the next 5 questions. (Be sure to use the correct distribution.) What is the confidence interval? Round to 2 decimal...
The length of time it takes a baseball player to swing a bat (in seconds) is...
The length of time it takes a baseball player to swing a bat (in seconds) is a continuous random variable X with probability density function (p.d.f.) f(x) = ( ax + 8/9 for 0 ≤ x ≤ b (c) Calculate (to 3 decimal places of accuracy) the median of X. (d) What is the probability that the baseball player takes between 5 and 10 swings (inclusive) before a swing whose length is greater than the median in part (c) occurs...
The length of time, in hours, it takes an "over 40" group of people to play...
The length of time, in hours, it takes an "over 40" group of people to play one soccer match is normally distributed with a mean of 2.2 hours and a standard deviation of 0.55 hours. A sample of size n = 80 is drawn randomly from the population. Find the probability that the sample mean is between 2.1 hours and 2.4 hours.
Let 'x' be a random variable that represents the length of time it takes a student...
Let 'x' be a random variable that represents the length of time it takes a student to write a term paper for Dr. Adam's Sociology class. After interviewing many students, it was found that 'x' has an approximately normal distribution with a mean of µ = 7.3 hours and standard deviation of ơ = 0.8 hours. For parts a, b, c, Convert each of the following x intervals to standardized z intervals. a.) x < 8.1   z < b.) x...
The length of time it takes to find a parking space at 9 a.m. follows a...
The length of time it takes to find a parking space at 9 a.m. follows a normal distribution with a mean of five minutes and a standard deviation of two minutes. a) Based upon the empirical rule, which is the probability that it takes less than one minute to find a parking space? b) Based upon the empirical rule, which is the probability that it takes more than 7 minutes to find a parking space? c) Find the probability that...
The length of time it takes to find a parking space at 8am follows a normal...
The length of time it takes to find a parking space at 8am follows a normal distribution with a mean of 10 minutes and a standard deviation of 3 minutes. 1.Find the probability that it takes at most five minutes to find a parking space. 2.Find the probability that it takes at least 13 minutes to find a parking space. 3.Find the probability that it takes between 9 minutes to 11 minutes find a parking space. 4.25% of the time,...
The length of time, in hours, it takes an "over 40" group of people to play...
The length of time, in hours, it takes an "over 40" group of people to play one soccer match is normally distributed with a mean of 4 hours and a standard deviation of 0.5 hours. A sample of size n = 50 is drawn randomly from the population. Find the probability that the sample mean is between 3.5 hours and 4.1 hours.
The length of time it takes to drive from Rexburg to CEI (assuming no construction delays!)...
The length of time it takes to drive from Rexburg to CEI (assuming no construction delays!) is uniformly distributed over the interval of 30.0 minutes and 37.0 minutes. (a) If one of the drives is randomly selected, find the probability that the drive takes between between 31.3 and 34.9 minutes. (b) What is the average time the drive takes? (c) Based on the uniform distribution described in this question, what is the probability that a drive will take longer than...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT