803 Answered Questions for the topic Probability & Statistics
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...
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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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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)...
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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...
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Probability & Statistics How Many Possible Ways
10/22/15
A multiple choice test has 15 questions with 1 correct answer and 3 incorrect answers for each.
How many ways can the test be answered if
a) all questions are answered
b) exactly two questions are left blank?
c) exactly three questions are answered incorrectly?
d) exactly 10 questions...
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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...
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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...
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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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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”....
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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...
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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...
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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...
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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 ...
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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...
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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...
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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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10/10/15
Probability help.
11% of all widgets are defective an inspector randomly sample 14 from a box. What is the probability of finding at least 2 defective widgets?
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Probability & Statistics
10/09/15
How do I find the probability of P(O given +) for this?
In the UK, 35% of the population are group A+, 8% are B+, 3% are AB+, 37% are O+, 7% are A-, 2% are B-, 1% are AB- and 7% are O-. A random sample of 9 people in the UK who are Rhesus + is taken....
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Probability & Statistics
10/08/15
A secretary has typed five letters to five different people, an addressed an envelope for each letter. The letter is put into the letter at random.
How many different assignments of letters to envelopes are possible? What is the probability that each person receives the correct letter?
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10/08/15
Stat probability help!
Suppose we roll an ordinary balanced six-sided die Let A = {1,2}, B = {2, 5}, C = {2, 4, 6}
What is P(A ∩ B ∩ C)
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Probability & Statistics
10/08/15
what is the binomial probability of P(1 < X = 3) when n= 7 and p=.4
what is the binomial probability of P(1 < X ≤ 3) when n= 7 and p=.4
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10/08/15
Suppose there is a 0.16 probability your roommate will forget to mail it. Should your roommate mail your letter, there is a 0.9 probability that post office wi
You ask your roommate to mail a letter for you. Suppose there is a 0.16 probability your roommate will forget to mail it.Should your roommate mail your letter, there is a 0.9 probability that post...
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