813 Answered Questions for the topic Probability & Statistics

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

05/19/16

Statistics
suppose you pay $2 to play a game of chance, in which you toss a coin and roll a die. you are paid 10 dollars if your coin shows a tail and you roll at least a even on the die. let the random... 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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Probability & Statistics

05/15/16

P is greater than or equal to 560
P(x≥560)
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Probability & Statistics

05/14/16

how many passwords are possible if three letters are followed by two digits
 probabilities and statistics
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Probability & Statistics

05/07/16

probability and statistics
3 cards are drawn randomly from a deck of 52 cards. What is the probability that at least one is a heart and one is a king?
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Probability & Statistics Statistics

05/07/16

sample proportion
According to a study conducted by an organization, the proportion of Americans who were afraid to fly in 2006 was 0.10. A random sample of 1300 americans results in 117 indicating that they are... more
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Probability & Statistics Probability Area Integration

05/06/16

A PDF is given by formula p(x)=2e^(-2x),x>0. Determine P(X>1).?
A PDF is given by formula p(x)=2e^(-2x),x>0. Determine P(X>1).? PDF being Probability Density Function A PDF is given by formula p(x)=2e^(-2x),x>0. Determine P(X>1).?
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Probability & Statistics Probability Expected Value Dice

05/06/16

Determining Probability from Expectation
A gambler is playing with a crooked(unfair) twelve-side die. The chances that certain side of a die will turn up is given in the table below, except for P5 and P6. Find P5 and P6 if it known that... more
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Probability & Statistics

05/06/16

I need help with this probs and statistics question
A baseball franchise finds that the attendance at its home hames has a mean of 16000 and a standard deviation of 4000. What percent of the home games have attendances between 12000 and 20000 people?
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Probability & Statistics

05/05/16

Compute the probability of answering 8 or more questions correctly by calculating the probability with a direct sum and by using complements.
I  did most of the work but I need some help on the last few questions! Thank you in advance!   Mrs. Hudson plans to give a 10 question multiple choice exam in which each question has 4 options.... more
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