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Probability

Standard Deviation

Question was asked previously and the calculations not detailed enough for me to determine how the answer was received. Please provide detailed explanation - I got a different answer and I KNOW mine is not right! Question: A manufacturing process produces units that average 10 inches in length with a standard deviation of 3

Stats questions

1.) A recent survey by the American Accounting Association revealed 23 percent of students graduating with a major in accounting select public accounting. Suppose we select a sample of 15 recent graduates. a. What is the probability two select public accounting? b. What is the probability five select public accounting? c. H

Given that an even number occurred, the probability that it was a 4 is?

Question 2: Using the normal approximation to the binomial to approximate the probability that X is at least 10, the area under the normal curve should be calculated from? Question 1: A die was tossed. Given that an even number occurred, the probability that it was a 4 is? Question 3: A coin is tossed 1,000 times. The probab

Probability Formula

A group of 30 people gather in a room. What is the probability that at least 2 of these people have the same birthday? The year of birth is not considered; having the same birthday means two peple were born on the same day of the year.

3810-stats

1. In a recent poll of married couples, about 79 percent of the men and 55 percent of the women were employed outside the home. In 39 percent of the couples, both the husband and the wife work outside the home. Find the probability that in a randomly selected couple either the husband or his wife works outside the home.

Construct a table giving the binomial distribution.

Construct a table giving the binomial distribution for each of the following: a) The probability of guessing correctly on a 10-question true-false test. b) The probability of guessing correctly on a 20- question multiple choice test, with 4 alternatives per question. c) For a 100-question true-false test, the normal approx

Continuous Random Variables

Please see the attached file for the fully formatted problem. f(y) = cy^2(1-y)^4 0<y<1 f(y) = 0, elsewhere Find the value of C that makes f(y) a probability density function, then find E(Y)

Probability Binomial distribution

1. A True-False test was developed for a Risk Management class. A student, who didn't study, decided to randomly guess the answer on each question. Assume that the probability that the student guess correctly on each question is 50%. The exam has 20 questions. A correct answer adds 1 to the test score, an incorrect answer adds 0

Probability distribution

Let X be a random variable with uniform distribution over the interval (0,1) and let Y = X^2 (X squared). Find the probability density function of Y.

Probability Using Tree Diagrams

I have three questions: 1. A woman has two children. What are the odds that both are boys? 2. Charlie hits the target 80 times in 100 shots. Jim hits the target 90 times in 100 shots. What are the chances that the target will be hit if each fires once? 3. In 1946, statistics showed that 2 percent of fruit boa

Calculating a probability from a binomial random variable

Assume that 12 percent of adults in this country have filed for bankruptcy at some point in their life. If an independent sample of 20 adults is selected find the probability that fewer than 5 will have filed for bankruptcy at some point in their life.

Probability problem

A rugby team of 13 consists of five backs, six forwards and two halves. (a) How many teams are possible from a squad of 17, consisting of six backs, eight forwards and three halves? (b) How many teams are possible from a squad of 17, consisting of six backs, eight forwards and two halves, and one player who could play as a

Calculating probabilities regarding seating on an airline.

Eagle airlines' planes hold only 15 people. Past records indicate that 20% of the people making a reservation do not show up. We will assume that all reservations are independent; that is each reservation is for one person and these reservations are made independent of one another. Suppose that Eagle Air decides to book 18 peopl

Stastics - Death rate

Currently, an average of 7 residents of the viallage of Westport (population760) die each year (based on data from the U.S. National center for Health Stastics) a.find the mean of deaths per day b. find the probability that on a given day, there are no deaths c.find the probability that on a given day, there is one death d.

According to Census Bureau...

Please see the attached file for full problem description. Ex 29 According to Census Bureau, deaths in the United States occur at a rate of 2,425,000 per year. The National Center for Health Statistics reported that the three leading causes of death during 1997 were heart disease (725,790), cancer (537,390), and stroke (159

Probability Problem

A box contains glass lenses used for traffic signals. Six are red, four are yellow, and seven are green. If two are chosen at random find the probability they are both green, if: a. the first lense is replaced before the second is chosen b. the first lense is not replaced before the second is chosen.

Probabilty

Make a probability distribution chart using reduced fractions to show the following information: The chart below shows the number of committee members who attended a meeting. # of members - 2-3-4-5-6 # of committees-3-9-8-4-6

Probability

A. If two events are dependent, then P(A/B) will equal _______________. b. If two events are independent, then P(A and B) will equal _______________. c. The rule for complementary events is useful for finding P(_______________). d. If two events are not mutually exclusive, P(neither A nor B) will equal

Busy Tellers - National Bank

I got confussed with this one. So if you can help me out. Thank You Busy Tellers. Prescott National Bank has six tellers available to serve customers. The number of tellers busy with customers at, say, 1:00 P.M. varies from daya to day and depends on chance, so it is a random variable, say, X. Past records indicate that the p

Problem demonstrating conditional probability

A math teacher gave her class two tests. 25% of the class passed both tests, and 42% of the class passed the first test. What percent of those that passed the first test also passed the second test?

Proability

Data ib west coast moviegoers in 2002 showed that 72.4% were male, 58.3% were under 25 years of age and 42.1% were males under 25 years of age. Let M=the event that the person is male and let A=the event that the person is under 25 years of age. Suggested to use a Venn Diagram. A. What is the probability that the person is

Probabilities

On the Titanic, the passenger roster showed that there were 1692 men, 422 women, 64 boys, and 45 girls. Only 332 men and 29 boys survived. 104 women and 18 girls died. Answer in reduced fraction form. A. What is the probability of selecting a person from the roster who was a man who survived? B. What is the probability of s

Probability

If 10% of the people who take a certain drug develop at least one of the side effects. Find the probability that in a sample of 20 people who take the drug: A. at most one will suffer side effects b. Exactly four will suffer side effects c. at least one will suffer side effects d. all 20 will suffer side effects Please

Statistical Probablilities

43% of adults report if the election were to take place today, they would vote for Kerry. A. If 1 adult is chosen at roandom, what is the probability the adult will NOT vote for Kerry? B. If 2 adults are chosen at random, what is the probability that BOTH will NOT vote for Kerry? C. If two adults are chosen at random, wha