744 Answered Questions for the topic Probability & Statistics

Probability & Statistics Statistics Probability

10/08/16

What is the probability that given the motorist arrived when the light was red that the motorist will need to wait more than 20 seconds?
In Tinytown there is one traffic signal with two states green and red. The signal is located at theonly intersecting streets in Tinytown. The traffic light is green for 90 seconds and then red... more
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Probability & Statistics Math Probability Math Help

10/05/16

Find the probability that a person whose result is positive is actually negative
The Centers for Disease Control (CDC) estimates that 0.6% of Americans have AIDS. The HIV-1 tests correctly diagnose the presence of HIV in 95% of the persons who have it and correctly diagnose its... more
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Probability & Statistics Math Probability Math Help

10/05/16

If 15% of adult females smoke..
An ectopic pregnancy is one where gestation occurs outside the uterus. The condition is twice as likely for a female who smokes than for one who is a nonsmoker. If 15% of Adult females smoke, what... more
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Probability & Statistics

10/05/16

Pricing and inventory
A retail shop sells 500 pairs of shoes each year. Each pair of shoes is priced at $50. Suppose that the shop can get each pair of shoes from their supplier at $20 and the ordering cost, regardless... more
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Probability & Statistics Probability Math Help Math Problem

10/03/16

Unfair coin, probability of selecting a girl?
An unfair coin with Pr[H]=0.2 is flipped. If the flip results in heads, a student is selected at random from a class of 12 boys and 10 girls. Otherwise, a student from a different class containing... more
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Probability & Statistics Statistics Question Math Analysis

09/28/16

Three marbles are drawn randomly WITH REPLACEMENT
Three marbles are drawn randomly WITH REPLACEMENT from a box with 5 blue and 7green marbles.(a) What is the probability that all the marbles drawn are green?(b) What is the probability that 2 of... more
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Probability & Statistics

09/18/16

Probabilities in statistcs
An ordinary (fair) die is a cube with the numbers through on the sides (represented by painted spots). Imagine that such a die is rolled twice in succession and that the face values of the two... more
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Probability & Statistics

09/14/16

Combination Probability Word Problem
At Northwest High School, there are 207 students in the Sophomore Class, 243 students in the Junior Class, and 189 students in the Senior Class. The teachers want to assign the students to... more
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Probability & Statistics

09/12/16

A radio station runs a promotion at an auto show with a money box with
A radio station runs a promotion at an auto show with a money box with 14?$100?tickets, 11?$50?tickets, and 12?$25tickets. The box contains an additional 20?"dummy" tickets with no value. Find the... more
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Probability & Statistics

09/12/16

why is the following not a probability model
0.3,-0.4,0.1,0.3,0.2,0.5
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Probability & Statistics

09/03/16

Moment Generating Function
show that g(t)=te^t cannot be a moment generating function.  
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Probability & Statistics

09/02/16

probability
15 students taking one oral and one written exam. What is the probability of 7 students getting 70 in the average?
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Probability & Statistics Probability

09/01/16

Probability and Stats problem. Please help
A large chain retailer purchases 45% of a certain kind of electronic device from Company A and the rest from Company B.  Suppose that the devices from Company A are defective 2% of the time, while... more
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Probability & Statistics Probability Math Help Math Help For College

08/25/16

What is the probability a randomly selected other student will score higher than you if you score in the 80th percentile?
What is the probability a randomly selected other student will score higher than you if you score in the 80th percentile on a standardized test?
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Probability & Statistics Probability Math Help Variables

08/25/16

For the following variables, would the distribution of scores approximate a normal curve?
For the following variables, would the distribution of scores approximate a normal curve? Please explain why and if its not going to have a normal curve, what distribution shape is it really likely... more
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Probability & Statistics Mean Median Mode Mean Mean And Median

08/22/16

What is a real life situation in which using the median is preferable to the mean?
What is a real life situation in which using the median is preferable to the mean? Number examples please!
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Probability & Statistics

08/18/16

What is the probability of you getting something that only has a 5% chance if you do it 14 times?
(Maybe I worded it bad, but if you get what im trying to say help me out.)
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Probability & Statistics

08/18/16

What is the probability of you getting something that only has a 5% chance if you do it 14 times?
im looking for the % of the chance you will get that 5% of somethign to happen.
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Probability & Statistics

08/03/16

Full question is below ,A dart randomly hits a dartboard that is composed
The answer I believe wilol be in fraction . A dart randomly hits a dartboard that is composed of concentric squares whose sides are x,y,and z, where x<y<z. In terms of x, y, and z, what is... more
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Probability & Statistics Probability Problem Solving Probability Stats

07/17/16

Assuming X is a binomial random variable, what is the probability exactly 3 cars are left unlocked?
There is a p=12.5% chance a parked car will have been left unlocked. X is the number of cars left unlocked in a parking lot with a total of 6 cars. Assuming X is a binomial random variable, what is... more
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07/17/16

Assuming X is a binomial random variable, what is the mean number?
There is a p=12.5% chance a parked car will have been left unlocked. X is the number of cars left unlocked in a parking lot with a total of 6 cars. Assuming X is a binomial random variable, what is... more
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Probability & Statistics Statistics Math Help Binomial Distribution

07/12/16

Confused on Binomial Probability
A brand name has aa 6060?% recognition rate. Assume the owner of the brand wants to verify that rate by beginning with a small sample of 55 randomly selected consumers. Complete parts? (a) through?... more
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Probability & Statistics

07/08/16

it is a fact that 19.7% of the residents of the Us are hispanic. suppose that 10 residents of the us were chosen. find the probability that all 10 are hispanic
Statistic problem
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Probability & Statistics Statistics Probability Statistics Question

06/27/16

A nonnegative integer-valued random variable X has a CDF of the form F(x)=1-(1/5)^x for x=1,2,.....and zero otherwise. Find P(X is odd)?
A nonnegative integer-valued random variable X has a CDF of the form F(x)=1-(1/5)^xfor x=1,2,.....and zero otherwise.Find P(X is odd)? could you please help me with that?
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Probability & Statistics Statistics Probability Statistics Question

06/27/16

Suppose a lie detector test has the following properties.
Suppose a lie detector test has the following properties.If the suspect is telling the truth,the lie detector will correct say so with probability 0.85.if the suspect is lying ,it will correctly... more
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