Explore BrainMass


Probability: Failures, Least Amounts and Joint Probability

1. There are five computers in an office. The probability of failure of a computer is 0.3. What is the probability that (a) there are 3 computers working, and (b) at least three computers working? 2. A computer service company is interested in the number of computers that fail. There are hundreds of computers in use in their

Statistics Normal Distribution

Assume that the population of heights of male college students is approximately normally distributed with a mean "m" of 68 inches and standard deviation "s" of 3.75 inches. A random sample of 16 heights is obtained: 1.) Describe the distribution of x, height of the college student. 2.) Find the proportion of male college

Power of a Statistical Test

The power of a statistical test is?: 1) the probability of not rejecting H o when it is false 2) the probability of rejecting H o when it is false

Probability ...

A test on probability is to be given next week. Suppose 75 percent of the students study for the test and 25 percent do not. If a student studies for the exam, the probability that he or she will pass is 0.90. If the student does not study, the probability that he or she will pass is 20 percent. Given that the student passed the

A Description of Normal Probability

The Director of Emergency Medicine at Big Mountain Medical Services is studying patient waiting time. Waiting time is defined as the time from when a patient enters the facility until seen by a physician. The study indicates the waiting time follows a normal distribution with a mean of 22 minutes and a standard deviation of 8 mi

STATISTICS: According to a study the popular belief is 80% of adults enjoy ...

1. According to a study the popular belief is 80% of adults enjoy drinking beer. If 3 adults were chosen at random from this study, what would the probability be that none of them enjoy drinking beer? Explain how you found your answer. 2. A family has 5 children and 1 of them is a boy...the percentage of boy is 1/5, or .020

Quantitative Decisions: Statistics, Probability, and Game Theory

Please see the attached document for properly formatted questions. 1. Nick has plans to open some pizza restaurants, but he is not sure how many to open. He has prepared a payoff table to help analyze the situation. States of Nature Alternatives Good Market Fair Market Poor Market Open 1 380,000 70,000 -400,000 Op

Standard deviation and probabilities.

1)Assume x is normally distributed with mean u=15 and standard deviation 0=3. Use the approximate areas beneath the normal curve, as discussed in this section, to answer the following questions. Find p(x<_9) 2)Your high school graduating class had 564 members. Thirty-three percent of these are expected to attend college. The

Simple random sample of overtime hours

Employees in a large manufacturing plant worked an average of 62.0 hours of overtime last year, with a standard deviation of 15.0 hours. For a simple random sample of n=36 employees and x=the number of overtime hours worked last year, determine the z-score corresponding to each of the following sample means:a)x=55.0 hours b)x=

Binomial Probability: find probabilities.

5.A marketing firm wants to target people who eat breakfast by sending out a new product. According to recent statistics three in four people eat breakfast. If the marketer sends out samples to 10 people selected at random, Find the probability using the binomial probability distribution formula. (Show all work) a. Exactly

Statistics & Probability : Sampling

1. On a national standardized test with a normal distribution of scores, a mean of 50, and a standard deviation of 3.2, a student's score is 1.2 standard deviations above the mean. What is the students score? 2. A national achievement test has a normal distribution, a mean of 1000, and a standard deviation of 100. What per


Suppose you are dealt a hand of 3 cards twice. What is the probability that you will receive exactly 2 kings in each of the two deals? How many different combinations can there be, such that, you will be dealt exactly two kings?

Calculating probabilities.

Approximately 14 percent of the population of Arizona is 65 years or older. A random sample of five persons from this population is taken. The probability that less than 2 of the 5 are 65 years or older is: A bank lobby has four video cameras positioned to view the entire lobby. Any one of the four is sufficient to monitor th

Calculating probabilities: 3 questions.

1) The odds of the Dallas Cowboys winning this year's Super Bowl are 3 to 1. Compute the probability of the Cowboys winning a).33 b).25 c).75 d) none. 2) An appliance dealer calculated the proportion of new dishwashers sold that required various numbers of service calls to correct problems during the warranty period. The r

Systems Engineering or Statics for MTBF and probability of failure

Please review these attached Systems Engineering problems and provide assistance. The problems are related to Mean Time Between Failure and failure rates for systems. --------------------------------------------------------------------- 10. The failure rate (&#955;) of a device is 22 failures per million hours. Two standby


If A and B are independent events with P(A) = 0.25 and P(B) = 0.60, then P(A/B) is? 2. Intentions of customers regarding future automobile purchases and the financial capability of the consumers are given below: Plan to buy qualify for within 6 6 months or

Probability ...

1. The salaries (in thousands of dollars) for a sample of 13 employees of a firm are: 26.5, 23.5, 29.7, 24.8, 21.1, 24.3, 20.4, 22.7, 27.2, 23.7, 24.1, 24.8 and 28.2. Compute the variances. 2. New York City is estimated to have 21 percent of the homes with TV sets served by cable TV. If a random sample of four is taken f

Statistics - Probability..

In a bag there are 20 marbles. The colors of the marbles are as follows: red - 5; blue - 8; green - 3; yellow - 4. a. What is the probability of selecting a red marble? b. What is the probability of selecting a blue marble? c. What is the probability of selecting a pink marble? None d. What is the probability of selectin


New Orleans Punch was made by Frutayuda, Inc., and sold in 16-ounce cans to benefit victims of Hurricane Katrina. The mean number of ounces placed in a can by an automatic fill pump is 15.8 with a standard deviation of 0.12 ounce. Assuming a normal distribution, what is the probability that the filling pump will cause an overflo

Street Parking Availability

On Monday, the probability there is a street space is .4. on Tuesday, the probability there is a street parking space is .3. What is the probability of finding a street parking place on both Monday and Tuesday? What is the probability of not finding a street parking place either day? What is the probability of finding a stree

Probability - The length of time to complete a door assembly on ...

The length of time to complete a door assembly on an automobile factory assembly line is normally distributed with mean 6.7 minutes and a standard deviation 2.2 minutes. For a door selected at random, what is the probability the asembly line time will be between 5 and 10 minutes? Answer to 4 decimal places.

Understanding and calculating probabilities.

1. A certain company reduced its management staff from 18 managers to 12. The company claimed that the 6 managers were randomly selected for job termination. However, the 6 managers chosen are the 6 oldest managers among the 18 that were employed. What is the probability that when 6 oldest managers are randomly selected from

Probability: Discrete and Continuous Probability Distributions

What is a probability distribution and its purpose? Distinguish between discrete and continuous probability distributions. Give an example of each. What is randomness? Assume you have an Excel worksheet of the dimension, A1:E101. The first row contains data labels. How would you randomize the data file and to select a

Binomial distribution: probability that 3 people will buy a Red Oak Floor

A business owner decides to use a binomial distribution to solve one of his problems. He knows there is a 60 percent probability that he will sell one of his Red Oak floors to any customer who comes into his shop and views the wood. Out of the next 7 people who come into his shop, what is the probability that 3 people will

Problems with probabilities

Please help with the following probability problem. A statistical experiment involves flipping a coin that is much thicker than a regular coin of the same diameter. When flipped, the probability for the thick coin to come to rest on its edge is 4 percent; otherwise it is a "fair coin" in the sense that we can get heads or ta

Find the probability of observing an event.

Among U.S. households, 24% have telephone answering machines. If a telemarketing campaign involves 2,500 households, find the probability that more than 650 have answering machines.