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Probability

Statistics - Probability Distribution and Mean Determination

Incubated time for black chicks is distributed with a mean of 21days and standard deviation of 1 day.using what is given, If 1000 eggs are being incubated how many chicks do we expect to hatch a) in 19-23 days, in 20 to 22 dayd b) in 21 days or fewer d) in 18 to 24 days assuming all eggs hatched. This is what is given:u-3(me

Probability

The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of inde

Random Variable/Uniform Distribution

A random variable Y is uniformly distributed over a range of 0 to 2*pi. Another random variable X is related to Y by X=cos(Y). Find the probability density function of X.

Airplane Alternators and Fatal Accidents Probability

1. A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the other will fail? Show all steps carefully. 2. The probability is 1 in 4,000,00

Probability

Problem 1. A local bank reports that 80 percent of its customers maintain a checking account, 60 percent have a savings account, and 50 percent have both. If a customer is chosen at random, what is the probability the customer has either a checking or a savings account? What is the probability the customer

Probability

Problem 2. A recent study of the hourly wages of maintenance crew members for major airlines showed that the mean hourly salary was $20.50, with a standard deviation of $3.50. If we select a crew member at random, what is the probability the crew member earns: a. Between $20.50 and $24.00 per hour? b. More than $24.00 per hour?

Probability: Boat Schedules and Weather

1. During summer weekdays, boats arrive at the inlet drawbridge according to the Poisson distribution at a rate of 3 per hour. In a 2 hour period, what is the probability that 2 boats arrive? Please provide the answer in the form 0.xxxx or .xxxx. 2. A researcher wants to simulate sunny and rainy days in her town for a 3

M&M Statistics

I have been working with M&M's throughout this classes course. From the data I gathered I developed histograms and calculated descriptive statistics. Based on this data I then can make judgments on what I can expect to see when I buy packages of M&M's at the store. To do this I calculate what is called confidence limits

Binomial Distribution for Monitoring Calls

According to a survey conducted by Peter, 37% of adults are concerned that employers are monitoring phone calls Use the binomial distribution formula to calculate the probability that a) out of 5 adults, none is concerned. b) out of 5 adults all are concerned. c) out of 5 adults, exactly 3 are concerned that employers are m

Probability

A Tamiami shearing machine is producing 10 percent defective pieces, which is abnormally high. The quality control engineer has been checking the output by almost continuous sampling since the abnormal condition began. What is the probability that in a sample of 10 pieces: a. Exactly 5 will be defective? b. 5 or more will

Probability and Expected Loss

X=age(years) 60 61 62 63 64 p(death at this age 0.00756 0.00825 0.00896 0.00965 0.01035 a) What is the probability that sara will die in her 60th year? using this probability and the $50,000 death benefits, what is the expected loss? b) Repeat part(a) for years 61,62

Probability of drawing two cards from a deck

2 cards drawn from a 52 but before the second card is drawn you put the first one back and reshuffle the deck a) Are the outcomes on the two cards independent and why? b) Find p(3 on first card and 10 on second), find p(10 on the first card and 3 on second). c) Find the probability of drawing a 10 and an 3 in either order.

Estimate the probability that the height of the arch opening

Height of arch, feet:.....3-9......10-29.....30-49....50-74.....75+ # of arches in park:......111........96..........30.........33........18 Use the information to estimate the probability that the height of the arch opening is a)3 to 9 feet b)30 feet or taller c)10-74 feet

Relative frequency and sample space

Estimate a probability that a seed from new plant will germinate a random sample of 3000 seeds, of those seeds 2430 germinated a) Use relative frequencies to estimate that the seed will germinate, estimate the probability that the seed will not germinate b) What is the sample space for this problem and does it add up tp 1?

Probability - Expotential Distributions

The distance between major cracks in highway follows an exponential distribution with a mean of 5 miles. a) What is the probability that there are no major cracks in a 10 mile stretch of highway. b) What is the probability there is 2 major cracks in a 10 mile stretch of highway c) what is the std deviation of the dista

The life of a roller bearing

Assume that the life of a roller bearing follows a Weibull Distribution with parameters: Beta = 2 and delta = 10000 hours. a) determine the probability that a bearing lasts at leasts 8000 hrs. b) Determine the mean time until failure of a bearing. c) If 10 bearings are in use and failures occur independently what is the pro

Probability Distribution of Hummingbirds Eggs Incubation Time

10. Wildlife Hummingbirds Selasphorus sasin is the scientific name for what is commonly called "Allen Hummingbird" This beautiful hummingbird lives on the west coast of the United States and is named C.A. Allen (1841-1930) , who studied these birds extensively. Let x be a random variable that represents the incubation time for

Simple Probability of Survey Results

Please help with the following problems. 3. Use this table to answer questions #3 through #5. Some students were asked if they carry a credit card. Here are the responses. Class______ | Credit Card Carrier | Not a Credit Card Carrier | Total Freshman______________33_______________________27________________60 Sophomore____

Finding probability of household purchases of ground coffee

During 2001, 61.3% of US households purchased ground coffee.These households spent an average of $36.16 on ground coffee during the year. Consider the annual ground coffee expenditures for households purchasing ground coffee, assuming that these expenditures are approximately distributed as a normal random variable with a mean o

Probability Distribution - Mean and Standard Deviation

1. On average, 40% of U.S. beer drinkers order light beer. (5 points) a. What is the probability that none of the next eight customers who order beer will order light beer? b. What is the probability that one customer will? c. What is the probability that two customers will? d. What is the probability that fewer than three w

Mean, Median and other statistics questions

1. Some normal probability distributions may have the same mean, but their standard deviation may be different True or False 2. As the sample size increases, the standard error of the sample mean increases. True or False 3. Which of the following statement(s) about the normal probability distribution is/are true?

Body Types and Probability

Body Types: A study on body types gave the following results: 45% were short; 25% were short and overweight; and 24% were tall and not overweight. Find the probabilities that a person is the following. a. Overweight b. Short, but not overweight c. Tall and overweight

Quality Control (Syringes) - Binomial Probability

Quality control: Syringes The quality control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of 8 syringes taken from the batch. Suppose the batch contains 1% defective syringes. a.) Make a histogram showing the probabilities of r=0, 1,2,3,4,

probability of tossing two fair dice

Problem 10) You roll two fair dice, one red and one green. a) What is the probability of getting a number less than 5 on both? b) What is the probability of getting a sum of 9 on the two dice? c) What is the probability of getting a 5 on both?

Pascal's Triangle and Probability

Describe a real-life situation where Pascal's Triangle can be used to calculate probability. Is this the best method for solving your calculation? If yes, why? If not, what other principle would you use?

One Time Fling - Binomial Model

4. Sociology: Ethics. The one-time fling! Have you ever purchased an article of clothing (dress, sports, jackets, etc.) worn the item once to a party, then returned the purchase? This is called the one time fling. About 10% of all adults deliberately do a one-time fling and feel no guilt about it. (Source: "Are you Normal?" By B

Applied Statistics: Auto Trip leading to a Fatal accident

The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of

Calculating Probabilities without Standard Deviation

I need some guidance in how to calculate probabilities without knowing the std deviation. Population = 3005 calculate P(x-bar > 50.8) for sample size of n = 253 calculate P(x-bar > 50.6) for sample size of n = 134 calculate P(x-bar > 51) for sample size of n = 119 Then combine the two probabilities 51 a