5,341 Answered Questions for the topic probability

Probability Math Calculus

06/13/23

Joint Density/Distribution

Let X and Y be jointly continuous random variables with a joint density given byfXY (x, y) = c where 20 < x < y < 40,where c is a constant. Find c and the joint distribution function for X... more
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Probability

06/13/23

Probability of certain numbers
If you pull 5 numbers from 1-69, not repeating, what is the probability of the number 1 being drawn, if it had been drawn 3 times out of 325
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Probability Statistics

05/30/23

Suppose we have events A and B so that P(A)=0.3 and P(B)=0.4 Find P(A or B) if P(A|B)=0.2
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Probability Statistics

05/30/23

Sample size find
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p∗=15%. You would like to be 90% confident that... more
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Probability Statistics

05/30/23

Can someone help me with these two?
You are interested in estimating the the mean weight of the local adult population of female white-tailed deer (doe). From past data, you estimate that the standard deviation of all adult female... more
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Probability Statistics

05/30/23

Construct confidence interval at 90% confidence
In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $42 and standard deviation of $13. Construct a... more
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Probability Statistics

05/29/23

Find Margin Error at 80% confidence level
In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $47 and standard deviation of $5. Find the margin of... more
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Probability Statistics

05/29/23

Estimating population proportion HELP - Prob/stats
1) You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p∗=30%. You would like to be 95% confident... more
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Probability Statistics

05/29/23

Solve for Sample Size - Prob/stats
You work for a marketing firm that has a large client in the automobile industry. You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. You have... more
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Probability

05/29/23

What is the probability that someone chosen at random likes only tea?
34 people were asked whether they liked tea, coffee or both. Twice the number of people who liked tea said they liked coffee. The number of people whop said they liked neither tea nor coffee was... more
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Probability

05/27/23

PROBABILITY DISTRIBUTION WITH MULTIPLE ATTEMPTS WITH UNIQUE PROBABILITIES
My problem relates to PROBABILITY. Issue is that I wish to calculate a CDF and/or PDF based on multiple attempts. As example : probability of "k" successes from "n" attempts. This is obvious with a... more
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Probability

05/21/23

10 nickels, 12 dimes, and 8 quarters. Once money is drawn from the jar, you do NOT replace the money two quarters in a row
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Probability

05/20/23

Odds of winning

Hellohow to callculate odds of winning one of two events of 40% chances to win?
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Probability

05/19/23

Conditional probability
S and T are two events. P(S)= 0.5 and P(T)=0.7. Given that S and T are independent. Find P(S | S'∩T'). How do you get 0.231?
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Probability

05/18/23

How many ways can 3 people can be seated in a row of 15 chairs?
(1) Find the number of ways 3 people can be seated in a row of 15 chairs, explaining each step in turn.(2) Use the binomial theorem to expand the following equation, explaining each step in turn: ... more
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Probability

05/16/23

ASV Intro to Probability 1.20
We roll a fair die four times.(a) Describe the sample space Ω and the probability measure P that model thisexperiment. To describe P , give the value P (ω) for each outcome ω ∈ Ω.(b) Let A be the... more
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Probability Math

05/15/23

How to solve combination?
How would I solve the following problem?I have 3 pairs of shoes, black, white and green.I need to figure out how many possible patterns there are to wearing them for 10 days where you pick one... more
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Probability Math Statistics

05/15/23

Probability question
A cash register contains 5 one-dollar bills, 6 five-dollar bills, and 4 ten-dollar bills. You take 3 random bills without replacement. What is the list of possible outcomes for the total sum of... more
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Probability Math Statistics

05/13/23

(a) State the null and alternative hypotheses. Will this be a one-tailed or two-tailed test? (b) What is the standardized test statistic?
In golf, the more energy that is transferred from the club to the ball increases the potential distance of a shot. Something called the “coefficient of restitution” (COR) measures this energy... more
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Probability Statistics

05/08/23

Urgent! Expected Value, total variance
The number of winter storms in a good year is a Poisson random variable with mean 3, whereas the number in a bad year is a Poisson random variable with mean 5. If next year will be a good year with... more
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Probability Precalculus

05/05/23

Solution with steps please!
400 fundraiser raffle tickets are sold for $20 each for four cash prize amounts: $350, 200, $100, $50. What is the expected value of the payout?  $1.75   -$18.25   -$18.05   -$1.75 
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Probability Math Statistics

05/05/23

How many ways are there to pull 7 cards from a standard deck with the first four being red, the last three being black, and no two ranks can be the same?
Every card has to have a unique rank. the first four cards must be red, and the last three cards must be black. This is a counting problem that does not require any combinations or permutations.
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Probability

05/04/23

Probabilty of left-handedness in a small, random group
In a group of 8 people in a doctor's waiting room, what is the probability that 5 of them will be left-handed? Please include forula so i can work it through myself. thanks.
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Probability Statistics

05/02/23

Find the probability
In a study of brand recognition, 1106 consumers knew of Exxon, and 2 did not. Use these results to estimate the probability that a randomly selected consumer will recognize Exxon.Report the answer... more
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Probability Statistics

05/02/23

Suppose we collect a random sample 27 rabbits and weigh them. We find that among these 27 rabbits, the average weight is 1.7 pounds with a standard deviation of 0.44 pounds.
Suppose we collect a random sample 27 rabbits and weigh them. We find that among these 27 rabbits, the average weight is 1.7 pounds with a standard deviation of 0.44 pounds. (a) Construct a 90%... more
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