744 Answered Questions for the topic Probability & Statistics
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...
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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...
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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...
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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...
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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...
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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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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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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...
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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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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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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....
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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...
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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...
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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
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...
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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)...
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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...
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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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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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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...
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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...
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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...
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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...
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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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