744 Answered Questions for the topic Probability & Statistics

Probability & Statistics Probability Statistics Question

11/16/15

needs to be answered ASAP please
harry needs to write christmas cards, however he can only write lists in these 2 ways   girl                 boy boy                girl girl                 boy   if there are 10 girls and... more
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Probability & Statistics

11/14/15

Finding the expected value of the net winnings and interpreting
A player pays$7 to play a game. There are 12 red, 4 blue, 3 white, and 1 orange balls. A ball is picked at random. If a red ball is picked the player gets nothing. If a blue ball is picked the... more
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Probability & Statistics Statistics Probability Statistics Question

11/14/15

An MP3 player is loaded with 50 musical selections: 20 rock selections, 13 jazz selections, and 17 blues selections.
The player is set on random play, so selections are played randomly and can be repeated . Determine the probability of each of the following outcomes. (a) The first four selections are all... more
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Probability & Statistics Math Statistics Statistics Question

11/13/15

In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the request
It is estimated that 3.2% of the general population will live past their 90th birthday. In a graduating class of 737 high school seniors, find the following probabilities. (Round your answers to... more
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Probability & Statistics

11/10/15

Probability of multiple objects to perform same action with various action chances
There are 5 objects. Each object has a 50% chance to travel straight along a path, 25% to travel left, and 25% to travel right. What is the probability for all 5 objects to travel straight and... more
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Probability & Statistics

11/04/15

A dice is tossed. If the number rolled is between 2 and 5 inclusive, what is the probability the number rolled is 4?
Determine whether the event is independent or dependent. Then finds is probability 
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Probability & Statistics

11/03/15

How do you find probabilities using the standard normal distribution
P(-2.46<z<1.74)
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Probability & Statistics

11/02/15

How many relay teams of 4 members can be cosen from a 9 member team to run in a relay race?
probability word problem0
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10/29/15

Statistics question using a normal distribution
The SAT and ACT college entrance exams are taken by thousands of students each year. The scores on the exam for any one year produce a histogram that looks very much like a normal curve. Thus, we... more
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Probability & Statistics

10/26/15

How to do Probability with general Multiplication rule
Need help doing probability with general multipication rule.
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Probability & Statistics Statistics Probability Statistics Question

10/26/15

Statistics/Probability question
Four balls with different colors: red, yellow, green, and blue, are placed in a box. Every time Amy picks up a ball, then puts it back to the box and draws one again, repeating it five times.  a)... more
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Probability & Statistics

10/23/15

The mean length of...
The mean length of angelfish is 8.8cm with standard deviation of 1.9cm. Assuming length is normal random variable, find the probability that a selected angelfish would be between 5.171cm and... more
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Probability & Statistics

10/22/15

The acidity of human...
The acidity of human blood measured on a pH scale and its normal random variable. The mean is 7.2; standard deviation is 0.15. Find the probability that a random person has pH greater than 7.23.
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Probability & Statistics

10/22/15

The probability that a...
The probability that a women is widowed or divorced is 0.65. 29 women are interviewed at random. X can be defined as number of women who are widowed or divorced. Find the standard deviation.
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Probability & Statistics

10/20/15

Two candidates are running...
Two candidates are running for president, John democrat and joe republican. A recent survey concluded that John democrat had a probability of 0.52 to win the election. 24 people are interviewed at... more
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Probability & Statistics

10/20/15

A state lottery...
A state lottery ticket costs $1. The probability of winning $1,000,000 is 0.0000001, the probability of winning 1,000 is 0.000005, and the probability of winning $10 is 0.0002. Find the expected... more
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Probability & Statistics

10/20/15

if 25% of us federal prison inmates are not us citizens, find the probability that 2 randomly selected federal prison inmates will not be us citizens
if 25% of us federal prison inmates are not us citizens, find the probability that 2 randomly selected federal prison inmates will not be us citizens
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Probability & Statistics Statistics Probability Normal Distribution

10/18/15

Beginner statistics question? Please help!! What formula should I use? How should I solve this?
Florida Hurricanes: The following distribution for X = annual number of hurricanes in the state of Florida was reported in an article entitled “What Seasonal Hurricane Forecasts Mean to Florida”.... more
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Probability & Statistics

10/17/15

Some probabilities are defined on infinite sample spaces
Some probabilities are defined on infinite sample spaces. For example, we could flip a coin until tails occurs. From everyday experience we might expect this to take a small number of flips, but... more
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Probability & Statistics Probability

10/15/15

An unfair coin with Pr[H] = 0.6 is flipped. If the flip results in a head, one student is selected at random from a class of 6 girls and 4 boys. If the flip res
An unfair coin with Pr[H] = 0.6 is flipped. If the flip results in a head, one student is selected at random from a class of 6 girls and 4 boys. If the flip results in a tail, one student is... more
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Probability & Statistics

10/13/15

if 45% of Adult females smoke, what percentage of ectopic pregnancies involve a female who smokes?
An ectopic pregnancy is one where gestation occurs outside the uterus. The condition is twice as likely for a female who smokes than for one who is a nonsmoker. If 45% of Adult females smoke, what... more
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Probability & Statistics Finite Mathematics Finite Homework

10/12/15

Probability help/ Homework help
assume that the probability density function for the random variable X is the one given in the table below:Value of X         Probability   1                          0.1   5                      ... more
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Probability & Statistics

10/12/15

among 25 to 30 year olds 34% say they have not used a computer while under the influence of peer pressure.
among 25 to 30 year olds 34% say they have not used a computer while under the influence of peer pressure. suppose 4 25 to 30 year olds are selected at random. what is the probability that at least... more
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Probability & Statistics

10/11/15

What is Jeff's expected earnings from the concert?
Jeff is producing an outdoor concert. He estimates that he will make 3500 dollars if it does not rain, and make 850 dollars if it does rain. The local weather station (which we'll assume is... more
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Probability & Statistics Probability Probability Problems

10/10/15

Probability
A fair pair of dice is rolled and the sum of the points is noted. What is the probabilit that one of the dice shows 3, given that the sum of the dice is 5. 
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