788 Answered Questions for the topic Probability & Statistics

Probability & Statistics

06/18/16

Find the constant term in the expansion
(x2+2/x)2
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Probability & Statistics

06/18/16

If 5 prizes are being selected (order matters), what is the probability that the first two prizes chosen are packages of skittles?
A bag contains 8 chocolate bars, 3 packages of skittles and 4 packs of gum.
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Probability & Statistics Statistics Probability Statistics Question

06/18/16

C.D.F ,F(x)
The random variable X has pdf given by f(x)=(1+x),-1<x≤0 and f(x)=(1-x),0<x<1      &   and  f(x)=(1+x),-1<x<0 and f(x)=(1-x),0<x<1    && Could you help me how... more
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Probability & Statistics Statistics Probability Statistics Question

06/18/16

which function can I choose to find the mean and why?
The random variable X has pdf given by f(x)=(1+x),-1<x≤0       and       f(x)=(1-x),0<x<1   which function can I choose to find the mean and why?
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Probability & Statistics Statistics Probability Statistics Question

06/18/16

percentile of the distribution of a continuous random variable
Could you explain to me how can we find percentile of the distribution of a continuous random variable since I search on internet but I did not find ?Thanks in advance
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Probability & Statistics Statistics Probability Statistics Question

06/15/16

Probability question: Chances of winning
A contest will award 100 winners with a voucher each. There are 300 participants. Elly joined the contest 3 times, but entering using her details, her sister's details, and her mother's details.... more
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Probability & Statistics

06/15/16

Find the range, variance, and standard deviation for the sample data.
Listed below are the durations (in hours) of a sample of all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample data. Is the lowest duration time... more
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Probability & Statistics

06/15/16

Find the range, variance, and standard deviation for the sample data.
Listed below are the gross amounts (in millions of dollars) earned in box office receipts for a recent movie. The amounts are listed in order for the first 14 days of the movies release. Find the... more
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Probability & Statistics Probability

06/14/16

A fair die is rolled 6 times. What is the probability of no more than three twos?
no other information 
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Probability & Statistics

06/12/16

Probability
A certain brand of candies have a mean weight of .8587g and standard deviation of .0524. A sample of these candies came from a package containing 442 candies, and the package label stated the... more
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06/11/16

The random variable X has pdf given by f(x)=(1+x),-1<x=0 and f(x)=(1-x),0<x<1
The random variable X has pdf given by  f(x)=(1+x),-1<x≤0 and f(x)=(1-x),0<x<1   a)Find F(x) and sketch its graph?   my solution: F(X)=(x^2/2)+x+1/2 , -1<x≤0 and F(x)=x-(x^2/2)... more
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Probability & Statistics

06/09/16

What is the probability she will choose a purple ribbon from the paper bag and a purple ribbon from the cloth bag?
In a paper bag, 4 of the 5 ribbons are purple. in a cloth bag, 1 of the 15 ribbons is purple. if violet chooses one ribbon from each bag at random what is the probability she will choose the purple... more
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Probability & Statistics

06/06/16

there are 11 members on a board of directors. If they must form a subcommittee of 3 members, how many different subcommittees are possible
How would I go about solving this problem?
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Probability & Statistics Statistics Probability

06/03/16

Show that f(x) is a pdf and then Find the mean by using the moment generating function
Let f(x)=[(x^2)(e^-x)]/2 for x>0 and zero otherwse: Show that f(x) is a pdf and then Find the mean by using the moment generating function? Could you please help me ?
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Probability & Statistics Statistics Probability

06/03/16

moment generating function
Let f(x)=4 e^(-4x) if 0<x<infinty, and zero otherwse:    Use the moment generating function to find E(x) and V(x)?   My solution: E(x)=m'x(t) when t=0 so E(x)=1/4 E(x^2)=m''x(t) when... more
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Probability & Statistics

06/01/16

How can I Sketch the graphs of F(x) and f(x)
The distributon function for the duration of a certain soap opera is F(x)=1-(16/x^2) , x> or equal 4 and F(x)=0 x<4 and the f(x)=32/x^3 , x> or equal 4 and f(x)=0 for x<4. How can I... more
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Probability & Statistics Statistics Probability

05/30/16

How can I know this problem talk about conditional probability , permutation, or combination ,Do you have any techniques for this .
How can I know this problem talk about conditional probability , permutation, or combination ,Do you have any techniques for this .always my teacher gives us problem , and it does not have any... more
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Probability & Statistics Statistics Probability

05/29/16

The distributon function for the duration of a certain soap opera (in tens of hours) is F(x)=1-(16/x^2) , x> or equal 4 and F(x)=0 x<4
The distributon function for the duration of a certain soap opera (in tens of hours) is F(x)=1-(16/x^2) , x> or equal 4 and F(x)=0 x<4 a)calculate f the probability density functon of the... more
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Probability & Statistics

05/26/16

An urn contains 4 red balls and 6 black balls.A sample of 4 balls is selected from the urn without replacement.find probability distribution for x
sample then find the probablity distribution for x
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Probability & Statistics

05/26/16

An average of 0.5 ship per day arrives at a certain deck.what is probability that after the departure of ship four days will pass before the arrival of next shi
An average of 0.5 ship per day arrives at a certain deck.what is probability that after the departure of ship four days will pass before the arrival of next ship?
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Probability & Statistics

05/23/16

Lorena has 4 hats, 11 blouses, and 9 skirts. How many different outfits can Lorena create?
Lorena has 4 hats, 11 blouses, and 9 skirts. How many different outfits can Lorena create?
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Probability & Statistics Probability Probability Problems

05/20/16

problem solving by conditional probability
 conditional probability     Professional athletes who play in the NLF are subject to random drug tests. Suppose the probability that the test shows a positive result given that the athlete is... more
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Probability & Statistics Statistics

05/20/16

HELP!! Find the probability that at least two students in the class have same bdays
A biology class has 3535 students. Find the probability that at least two students in the class have the same birthday. For? simplicity, assume that there are always 365 days in a year and that... more
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Probability & Statistics Statistics Probability Statistics Question

05/18/16

Let P(A)=P(B)=0.42 and P(AnB)=0.13 Find P(A'?B')
Let P(A)=P(B)=0.42 and P(A∩B)=0.13   Find P(A'∪B')   solution   P(A'∪B')=P(A)+P(B)-P(A∩B)              =0.42+0.42-0.13=0.71   Is it correct?
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Probability & Statistics

05/16/16

Find the conditional distribution
Suppose that(i) ε ∼ N (0, σ2);(ii) X ∼ N (µ, τ 2);(iii) ε ⊥⊥ X;(iv) Y = α + β X + ε.(a) Find the conditional distribution of Y given X = x.   the solution is:  Y |X = x ∼ N (α + β x, σ2) But, to... more
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