8,918 Answered Questions for the topic statistics

Statistics

07/15/22

What are the chances that one places exactly 3 bets before stopping?
A roulette wheel has 38 numbers. Eighteen of the numbers are black, eighteen are red, and two are green. When the wheel is spun, the ball is equally likely to land on any of the 38 numbers. Each... more
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Statistics

07/13/22

What is the probability a car's brakes are good given that the mechanic says its brakes are good?

Suppose that of all used cars of a particular year, make, and model, 50% have bad brakes. You are considering buying a used car of this year, make, and model. You take the car to a mechanic to have... more
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Statistics

07/12/22

Suppose that we have a random sample X1, ..., Xn from a Bernoulli(p) distribution. What is the maximum likelihood estimator (MLE) of p?
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Statistics Math Probability

07/12/22

i need help with this :))))
Miranda decided to buy a $50,000 term life insurance policy from Palmetto Insurance Company to cover her until she is 55. She is currently 50 years old and in good health. The probability of death... more
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Statistics

07/11/22

Find the alpha level and the critical region.
I think I understand it however I just want to be certain.GRE scores are on a 130–170 μ = 140 σ = 15n =100, students who took a GRE course to improve their test scores. after the course the average... more
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Statistics Math

07/11/22

Below is a probability distribution for the number of days worked per week for a sample of adults:
Below is a probability distribution for the number of days worked per week for a sample of adults:Task 1: Find the mean of the probability distribution. (remember not to use the built in excel... more
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Statistics

07/11/22

statistics question
A sales agent has received a job offer from a trading house that distributes electric stoves.Suppose that X is the random variable that represents the number of kitchens sold in a week... more
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Statistics

07/11/22

spinner has equal regions numbered 1 through 21. What is the probability that the spinner will stop on an even number or a multiple of 3?
spinner has equal regions numbered 1 through 21. What is the probability that the spinner will stop on an even number or a multiple of 3?
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Statistics

07/11/22

A spinner has equal regions numbered 1 through 21. What is the probability that the spinner will stop on an even number or a multiple of 3?
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Statistics Math Probability

07/10/22

Probability of certain cards in 10 card poker
Find the probability of being dealt seven clubs and three cards with one card of each other remaining suit in 10​-card poker.
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Statistics Math Probability

07/10/22

What is the probability of these two scenarios?
A shipment of 13 microwave ovens contains 3 defective units. A restaurant buys three of these units. What is the probability of the restaurant buying at least two nondefective​ units?The... more
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Statistics Math

07/10/22

Normal Distribution Question:
The heights of adult males are normally distributed with the following parametersMean: 70 inchesStandard Deviation: 3 inchesTask 1: The average NBA player is 6'7", or 79 inches tall. What is the... more
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Statistics

07/10/22

What is the confidence interval estimate of the population mean μ?

A food safety guideline is that the mercury in fish should be below 1 part per million​ (ppm). Listed below are the amounts of mercury​ (ppm) found in tuna sushi sampled at different stores in a... more
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Statistics

07/10/22

statistics math question
A food safety guideline is that the mercury in fish should be below 1 part per million​ (ppm). Listed below are the amounts of mercury​ (ppm) found in tuna sushi sampled at different stores in a... more
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Statistics

07/10/22

Statistics - Method of Moments Estimators
A random sample of n observations, 𝑌_1,𝑌_2,…,𝑌_𝑛 is selected from a population in which 𝑌_𝑖, 𝑖=1,2,…𝑛, possesses a gamma probability density function with parameters 𝛼 and 𝛽. How many parameters ?... more
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07/10/22

How to calculate the likelihood?
We will define the following probabilities for a PCR test:p - The probability that a pcr test of a **sick** person, will show us a positive result.q - The probability that a pcr test of a... more
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Statistics

07/09/22

Questions A, B and C
The taxi and takeoff time for commercial jets is a random variable x with a mean of 8.2 minutes and a standard deviation of 3.5minutes. Assume that the distribution of taxi and takeoff times is... more
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Statistics

07/09/22

a) escape dune move a distance of more than 90 feet in 8 yrs. B) escape dune move a distance of less than 80 feet in 8 yrs. C) escape dune will move a total distance of between 80 and 90 feet in 8 yrs
It's true — sand dunes in Colorado rival sand dunes of the Great Sahara Desert! The highest dunes at Great Sand Dunes National Monument can exceed the highest dunes in the Great Sahara, extending... more
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Statistics Math Probability

07/09/22

What is the probability of tossing head and then rolling a number greater than two
A coin is tossed in a six sided dice number one through six is rolled. Find the probability of tossing ahead and then rolling a number greater than two. The probability of tossing ahead and then... more
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Statistics

07/08/22

Sketch the region corresponding to the statement P(z > c) = .45
The arrows can only be dragged to z scores that are accurate to 1 place after the decimal point (these values correspond to the tick marks on the horizontal axis). So round all z scores to 1... more
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Statistics

07/08/22

What is the approximate percentage of students who scored between 46 and 70 on the test? Round to two decimal places.
The maximum possible score on the test was 110, while the mean score was 70 and the standard deviation was 8.Is the answer 0.5?
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Statistics

07/08/22

Find the Expected value
A fundraising raffle where they sold 3994 tickets for 5$ each. There was one first-place prize worth 852$ and 5 second place prizes each worth 20$. What is the Expected value?
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Statistics

07/08/22

What is the probability of winning?
Supposed a certain game is fair and costs 9$ if you lose and the net payoff of 4$ if you win. The only possible outcomes of the game are winning and losing. Is the answer 0.55?
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Statistics

07/07/22

Need help finding the critical value
Find the critical value z of 83%. Round to two decimal places. I get it all divided out but when it comes to finding the critical value I have no idea how to find that number.
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Statistics

07/06/22

Measures of Center and Spread
For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 25 students, and the distribution of total study hours per week is... more
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