788 Answered Questions for the topic Probability & Statistics

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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Probability & Statistics Statistics Probability Statistics Question

06/27/16

A lot consists of 15 articles of which 8 are free of defects ,4 have minor defects and 3 have major defects.Five articles are selected at random without replace
A lot consists of 15 articles of which 8 are free of defects ,4 have minor defects and 3 have major defects.Five articles are selected at random without replacement find probability that at most... more
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Probability & Statistics Statistics Probability Statistics Question

06/21/16

Find the probability that the roots of the equation h(t)=0 are real where h(t)=t^2+2tx+y
assume that x and y are independent with x ~EXP(2) and Y~Exp(1) Find the probability that the roots of the equation h(t)=0 are real where h(t)=t^2+2tx+y   Could you please help me how can I find... more
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Probability & Statistics Statistics Probability Statistics Question

06/20/16

what is the probability that at least one scored 650 or better?
math sat scores are normally distributed with mean 500 and standard deviation of 100 ten students are selected at random what is the probability that at least one scored 650 or better?   please... more
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Probability & Statistics Statistics Probability Statistics Question

06/19/16

what distribution can be used to approximate probabilities for x ?
A computer terminal can pick up an erroneous signal from thekeyboard that does not show up on the screen. This creates a silenterror that is difficult to detect. Assume that for a particular... more
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Probability & Statistics Statistics Probability Statistics Question

06/19/16

A multiple choice quiz has 10 questions each with four alternatives.
A multiple choice quiz has 10 questions each with four alternatives. Apassing score is 6 or more correct. If a student attempts to guess the correct answer to eachquestion what is the probability... more
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Probability & Statistics

06/18/16

If Jill's mark is in the 20th percentile, what was her test score?
A class of 26 students has test scores normally distributed with a mean of 54 and a standard deviation of 6.2
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