282 Answered Questions for the topic Probability Problems

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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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 Problems

06/26/16

Probability problem looking for lowest cost.
In this problem let's say you have a certain amount of coins. You are playing a game where you bet up to 5 coins every round. If you bet 1 coin you have 20% chance of winning, if you bet 2 coins... more
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Probability Problems

06/22/16

A bag contains 8 red marbles, 6 blue marbles and 3 green marbles. If three marbles are drawn out of the bag,... click
Just answer please. I suck at probability and need like an example on how to solve this... Questin: A bag contains 8 red marbles, 6 blue marbles and 3 green marbles. If three marbles are drawn... more
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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... more
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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... more
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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... more
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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... more
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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... more
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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.... more
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06/13/16

Expected Value + Probability
Twenty distinct integers are arranged in a list in a random order, such that all 20! orderings are equally likely. Going down the list, one marks every number that is larger than all earlier... more
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Probability Problems

06/12/16

probability
You and some of your friends decide to visit the Eastern Idaho state fair. One of your friends comes to you and says that he wants you to play this new game he found. He says he just played it and... 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 Problems

06/10/16

a fair six sided dice is thrown. what is the probability that the die shows a number less than 2 or an even number?
it deals with probability. 
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Probability Problems

06/08/16

Probability
If the chance of an overnight freeze in Rexburg on any given night is 0.65, what is the probability that it will freeze one or more of the next 14 nights in Rexburg?
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Probability Problems Algebra 1 Algebra 2 Probability

05/30/16

permutation and combination. Please read the description
The burger shop offers cheese, lettuce, tomato, and pickles. Assuming that you are not concerned about where the toppings are, how many different ways can you order?
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Probability Problems Algebra 1 Algebra 2 Discrete Math

05/30/16

security codes are made of 3 letters followed by four single digit numbers
security codes are made of 3 letters followed by four single digit numbers. How many different 7 character security codes can be made if none of the letters can repeat and the first digit must be odd? more
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Probability Problems Algebra 1 Algebra 2 Probability

05/30/16

6 different colored beads are on an anklet with no clasp. How many ways can the beads be arranged on the anklet?
Can you help me find the answer to this question please
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Probability Problems Algebra Transition

05/30/16

there are 13 students on the golf team. How many different 4-person groups could Mr. Smith choose to go to the tournament this weekend
can you help me find the answer to this question please
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Probability Problems Fraction Percent Ratio

05/21/16

The probability of a child being a boy instead of a girl is 50% or 1/2. If a couple has 6 children, what is the probabilty that they had 3 boys and 3 girls?
Please express the answer in either percent, fraction, or ratio form. Thank you in advance! 
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Probability Problems Probability Probability & Statistics

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 Problems

05/19/16

How many different signals can be made with 5 flags from 8 flags of different colors?
trying to figure out these probabilities  
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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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