5,341 Answered Questions for the topic probability

Probability

08/11/21

Probability of having concert seats 109 and 110 for separate concerts
I went to an Alan Parsons Project concert in Feb 2020. I got seats 109 and 110. I flew from my residence in PA to CA to see Alan Parsons at The Sabin Theater in LA. About Feb of 2020 as well I... more
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Probability

08/10/21

Two dice are rolled. Determine the probability of the following. ("Doubles" means both dice show the same number.) rolling a 4 or doubles
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Probability Math

08/10/21

A pair of dice are tossed. What is the probability that doubles are rolled, given that the sum on the two dice is less than 10?
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Probability Mathematics

08/09/21

Help with Permutation and combination question!
You have 10 concert tickets of EDM and 7 concert tickets of classical singer . What is the total number of ways in which tickets can be given to three person if they may receive any number of... more
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08/07/21

probability density function
Let X be the amount of time (years) before a new battery stops working. X has the probability density functionf(t) = { C e^(-0.4t) , t ≥ 00 , otherwise,where C is a constant.Find C (using (Pr(-inf... more
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08/07/21

probability density function, find SD(X), find cumulative distribution function (CDF)
Let X be the amount of time (years) before a new battery stops working. X has the probability density functionf(t) = { C e^(-0.4t) , t ≥ 0 0 , otherwise,where C is a... more
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Probability

08/07/21

probability, Statistics
Consider a scenario that you when to a shop where you are the fourth person in the line to purchase the item (you only want to purchase bottle), shop keeper only has two bottle and one... more
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Probability Math Statistics

08/07/21

A box with 5 white balls, and 4 balls from which four balls were selected. calculate:
the probability of getting two white balls. the probability of getting a white ball at most. the probability of getting at least two blue balls.
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Probability Math Statistics Maths

08/07/21

A die is tossed twice. Given that the sum is greater than 7, what is the chance of getting a pair?
A die is tossed twice. Given that the sum is greater than 7, what is the chance of getting a pair?
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Probability Math Statistics

08/07/21

Probability question: A spaceman's supply of oxygen comes from two independent sources.
A spaceman's supply of oxygen comes from two independent sources. Source A has probability 0.9 of working, and Source B has probability 0.8 of working. What is the probability that at least one of... more
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Probability Math Statistics

08/06/21

A coin has been dropped three times in a row and each time the face is observed:
What is the probability of getting a head in the second drop?
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Probability Statistics

08/05/21

would you believe that the mathematician's estimate for the population proportion of pennies with post-2000 mint dates is mistaken?Briefly explain your reasoning. 
Suppose a mathematician arrives at the estimate that 70% pennies in circulation were minted after the year 2000. We take a random sample of 5 pennies and only 2 of the pennies (40% ) have post-2000... more
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Probability Statistics

08/04/21

Can a Random Variable be a Sample or just a Single Value?
In my introductory statistics course, I've seen statements like 'Y1 . . . , Yn is a simple random sample without replacement, of size n, from the population.' and that the CLT applies if 'Y1, . . .... more
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Probability Math

08/04/21

Probability question
A factory produces solar batteries. The probability of a new battery being defective is 3%. However, if the manager is on duty, the probability of a new battery being defective changes to 2%. The... more
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Probability Math Statistics

08/02/21

How can I calculate this? A box which contains five white balls, and three blue balls from where four balls were selected which were chosen.

Determine:a. the probability of receiving two white balls.b. the probability of receiving at most a white ball.c. the probability of receiving at least two blue balls.
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Probability

08/02/21

Probabilty Please help and explain in detail how you came to the answer
According to Statistics Norway, there are a total of 1,079,641 mothers among Norwegian women born 1935-1991. Among these, 860209 have at least two children, 368 445 have at least three children,... more
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Probability

07/31/21

Calculation of joint probability distribution function

Question: (Two Functions of two RVs, Z = g(X,Y), W = h(X,Y)) Let X and Y be two exponentially distributed independent Random Variables with the same parameter (λ). Let Z = X + DY = g(X, Y), and W =... more
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Probability Statistics

07/30/21

Probability question Im stumped
 A company has invested $100,000 in a plant which should meet all foreseeable demand for a patented product. The annual demand is normally distributed with a mean of of 20,000 units and a standard... more
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07/29/21

Ina box contain 21 marbles: 6 white, 7 black, and 8 yellow. Randomly pick out one marble and return it back to the box for 8 times. What is the possibility to get exact 4 white and 3 black marbles?

The answer has four decimal place.
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Probability Statistics

07/28/21

What is the probability?
A life insurance salesman finds that, of all the sales he makes, 70% are to people who already own policies. He also finds that, of all contacts for which no sale is made, 50% already own life... more
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Probability Statistics

07/28/21

What are the events?
A dean has found that 62% of entering freshmen and 78% of community college transfers eventually graduate. Of all entering students, 73% are entering freshmen and the remainder are community... more
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Probability College Algebra

07/27/21

Probabillity Question

Two people are selected at random from eleven men and ten women. Find the probability that the first is a woman and the second is a man.
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Probability Statistics

07/27/21

Probabibility and combinatorics
Of 100 patients with a certain disease, 10 were chosen at random to undergo a drug treatment that increases the cure rate from 50% for those not given the treatment to 75% for those given the drug... more
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Probability Statistics

07/27/21

Probability of an event
A jury of 12 members is to be selected from a panel consisting of 8 men and 8 women. a. How many different jury selections are possible?b. If the choice is made randomly, what is the probability... more
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Probability Math

07/27/21

Matthew flips 2 coins, what is the probability that he will get
a.  only one tail.                                                                      b.  two heads.
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