760 Answered Questions for the topic Probability & Statistics

Probability & Statistics Math Probability Word Problem

11/18/15

markov chains
If the animal is in the woods on one observation, then it is three times as likely to be in the woods as the meadows on the next observation. If the animal is in the meadows on one observation,... more
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Probability & Statistics Math Statistics Statistics Question

11/17/15

Find a 90% confidence interval for the population average startup costs µ for candy store franchises
Do you want to own your own candy store? Wow! With some interest in running your own business and a decent credit rating, you can probably get a bank loan on startup costs for franchises such as... more
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Probability & Statistics Math Statistics Statistics Question

11/17/15

Compute 95% and 99% confidence intervals for µ using Method 1 with a Student's t distribution!
When σ is unknown and the sample is of size n ≥ 30, there are two methods for computing confidence intervals for μ. Method 1: Use the Student's t distribution with d.f. = n − 1. This is the... more
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Probability & Statistics Math Statistics Statistics Question

11/17/15

A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop. What is the margin of error? Hint
What price do farmers get for their watermelon crops? In the third week of July, a random sample of 38 farming regions gave a sample mean of x = $6.88 per 100 pounds of watermelon. Assume that σ is... more
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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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