5,341 Answered Questions for the topic probability

Probability Statistics

07/06/22

This problem outlines a proof of the following equalities?
if ˆX = aX + b and ˆY = cY + d, then a) pˆX,ˆY = pX,Y and b) Cov[ˆX,ˆY] = acCov[X,Y](a) Show that ˆX −E[ ˆX] = a(X −E [X]), ˆY −E[ ˆY ] = c(Y −E [Y ]). (b) Use part (a) to show that Cov [ ˆX, ˆY ]... more
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Probability

07/04/22

RNG percentage ratios based on completion time
so theres 2 scenarios that can completed in the sameframe of time - but both have different (random number generator)possible chances for a targeted reward#1 - task that takes the whole block of... more
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Probability

07/03/22

Probability density

From this density, the probability that Z>1.74 or x<0.02
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Probability Statistics

07/03/22

Uniform Distribution
The lengths of a professor's classes has a continuous uniform distribution between 50.0 min and 52.0 min. If one such class is randomly selected, find the probability that the class length is... more
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Probability Math Algebra 1 Algebra 2

07/03/22

It's urgent plz
Consider the name as MARIAHOSSAIN and Roll number as 21101164.1.Find the total number of arrangements from the letters of your name taken all at a time without changing the the positions of vowels... more
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Probability

07/03/22

A box contains 2 brown cards, 3 black cards, 4 blue cards, and 1 white card. What is the probability of randomly choosing a black card AND THEN a blue card if no cards are replaced?
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Probability Math Sat Math Act Math

06/30/22

Tricky probability question
A table-tennis championship for 2n equally good players is organized as a knock-out tournament with n rounds, the last round being the final. Two players are chosen at random. Calculate... more
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Probability Math Sat Math Act Math

06/30/22

Hard probability question
Four mice are chosen (without replacement) from a litter, two of which are white. The probability that both white mice are chosen is twice the probability that neither is chosen. How many mice are... more
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Probability Statistics

06/30/22

Suppose that x is a normal random variable with u=5 and o=2. What is the probability that the absolute value of x is at least 8.74?
µ=5σ= 2
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Probability

06/29/22

Need help on the two biased coin problem
Two biased coins are tossed 126 times. 36 trials are both heads and 44 trials are both tails out ofthese 126 trials. Among the rest, 16 trials have head in the first coin while tail in the second... more
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Probability Algebra 2 Statistics

06/28/22

To create an entry​ code, you must first choose 2 letters and​ then, 6 ​single-digit numbers. How many different entry codes can you​ create?
It must be a whole number
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Probability Statistics

06/27/22

What is the probability of getting 0 queens after drawing 7 cards?
Standard 52 card deck with 4 queens.
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Probability

06/26/22

In a large population, 53% of the people have been vaccinated. If 3people at random are selected, what is the probability that at least one of them has been vaccinated If

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Probability Math Python

06/23/22

Python Question regarding normal distribution probability
Suppose the annual rainfall, in inches, in some region is normally distributed with μ=10 and σ=5. What is the probability that it takes (strictly) more than 10 years before a year with 20 inches of... more
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Probability Math

06/23/22

Uniform Distribution Probability Question
Suppose trains heading for destination A arrive at the station every 15 minutes, starting at 7 A.M., while trains heading for destination B arrive at the station every 15 minutes, starting at 7:05... more
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Probability

06/22/22

Statistics and Probability
Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed with a mean of 250 feet and a standard deviation of 42 feet. Let X = distance in feet for a fly... more
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Probability

06/22/22

Dice probability
In a game of chutes and latters, suppose you need a 4 to win the game. You are rolling a 6-faced fair die. What is the probability that you will win the gam on the third try?
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Probability

06/16/22

Probablity of doughnuts
A tray has 16 doughnuts, 9 of which contain raspberry jam and 7 of which contain ... jam and then Alexander randomly selects a doughnut with lemon curd?
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Probability Math

06/16/22

Probability Question
Spongebob is going Jellyfishing (that is, he seeks to capture jellyfish in a net, and then release them, of course).He plans to try his luck in two separate fields. Note that he is going to go... more
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Probability Math

06/16/22

Probability Question: Coin Toss
Suppose you have two coins in a sack, where one is fair and the other is weighted to come up heads only 1/31/3 of the time. Draw one at random, and flip until you get a head. Let X be the number of... more
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Probability

06/15/22

If there was a random group of 4 people, what is the probability that 2 people are born in the same month?
same as title. and then also probabilities for groups of 5,6,7,8,9 and 10 that would have 2 people born in the same month
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Probability Statistics

06/13/22

Estimating odds
Let's say a basketball player has a 55% chance to score more than 20 points in a game. Without any additional information, is there a way to best estimate the odds of that player scoring more than... more
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Probability Math Algebra 1 Statistics

06/12/22

Blackjack probability
Hello,In a heads up blackjack match, what are the odds the dealer will get a 19 with a total of 7 cards?This is based on an 8 deck game.I recently had a dealer get the following:1) 3 of Diamonds2)... more
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Probability Math

06/11/22

Probability Question
Twenty elk live in a forest, and 7 were tagged and released. Some time later, 5 elk were randomly caught. Assume all 20 elk were equally likely to be caught. What is the probability that exactly 2... more
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Probability Math

06/11/22

Probability Question regarding a coin toss
What is the probability that in 7 coin tosses we get exactly 5 heads and 2 tails? Do NOT round.
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