5,385 Answered Questions for the topic probability

Probability Chance

08/16/21

Probability question. (must be in decimal form)
Question. The probability that Samantha gets a multiple-choice question correct is 0.6. Sammantha attempts 3 multiple choice questions. The probability that she gets at least one correct is:
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08/16/21

Continuous Probability Distributions, Normal Distribution: If 500 pupils' scores that were gathered are within a normal distribution..
If 500 pupils' scores that were gathered are within a normal distribution, and that the mean is 70, the variance is 16, and the standard deviation is 4:1) At random, a pupil was chosen. What is the... more
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08/15/21

The question is about probability and about actuarial statistics
The question has 3 parts -Question- In a class of 92 students probability of you getting to the top is half of any other student. What is the probability of you getting to the top ?These 92... more
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Probability Math Statistics

08/15/21

Probability Question
Probability Question pls help10 randomly selected children are asked if they eat this kind of fruits: mango, blueberry, strawberry, apple, grapes, avocado, orange, bananaChild 1 - blueberry,... more
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Probability Math Help

08/15/21

Probability Question pls help
10 randomly selected children are asked if they eat this kind of fruits: mango, blueberry, strawberry, apple, grapes, avocado, orange, bananaChild 1 - blueberry, strawberry, banana, mangoChild 2 -... more
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Probability

08/13/21

2 probabilities

The end result should only be 1 of 2 (green or blue).Scenario 1 : A+B has 55% probability of equalling green.Scenario 2 : C+D has 72% probability of equalling green.Question : can the 2 scenarios... more
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Probability

08/12/21

Combine 2 probabilities
There is a pathway with a farm on each side (right and left)A: a chicken walks through the pathway and has 75% probability of turning right going to the right farmB: a duck walks through the... more
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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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