8,958 Answered Questions for the topic statistics

Statistics Math

10/19/22

what is the percentage of scores between two numbers if you have a mean and standard deviation
the question is "If the mean is 95 and the standard deviation is 12.5, what percent of employees would have IQs between 90 and 110?
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Statistics

10/19/22

Statistics math

After giving a test to a group of students, below is the summary of grades and gender.    A B C Total Male 8 9 16 33 Female 10 20 19 49 Total 18 29 35 82 If a student is randomly chosen,... more
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Statistics

10/18/22

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You work for a marketing firm that has a large client in the automobile industry. You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. You have... more
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Statistics

10/18/22

helppppppppppppppppppppp
A pollster wishes to estimate, with 95% confidence, the proportion of people who approve of how President Trump is performing his job.Find the minimum sample size necessary to achieve a margin of... more
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Statistics

10/18/22

help help help help
Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If we want to estimate this proportion to within 3% at the 95% confidence level, how many randomly... more
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Statistics

10/18/22

I am not getting the correct answer when i square

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=28.3σ=28.3. You would like to be 95%... more
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Statistics

10/17/22

what is the probability that the die lands on a 13 or a 1
Suppose a special 14-sided die is rolled once where each face is marked with a number 1 through 14. What is the probability that the die lands on a 13 or a 1?
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Statistics

10/17/22

will the range of 10 prime numbers be larger than the first 5 perfect square numbers?
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Statistics

10/17/22

How many different meals are available when you select an​ appetizer, an​ entrée, and a​ dessert?
A restaurant offers a​ $12 dinner special that has 7 choices for an​ appetizer,13 choices for an​ entrée, and 3 choices for a dessert. How many different meals are available when you select an​... more
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Statistics

10/17/22

Probability Stats
A jury has 12 jurors. A vote of at least 10 of 12 for "guilty" is necessary for a defendant to be convicted of a crime. Assume that each juror acts independently of the others and that the... more
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Statistics

10/16/22

ores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 20. What percentage of people has an IQ score between 40-160?
Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 20. What percentage of people has an IQ score between 40-160?
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Statistics Math

10/16/22

I need help with some elementary stats ASAP!
The readings on the scientific thermometers are normally distributed with a mean of 0º C and a standard deviation of 1º C. This is an example of the standard normal distribution. Use... more
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Statistics

10/16/22

Stats Probability

A jury has 12 jurors. A vote of at least 10 of 12 for "guilty" is necessary for a defendant to be convicted of a crime. Assume that each juror acts independently of the others and that the... more
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Statistics

10/15/22

What’s the probability

Assume that when adults with smartphones are randomly selected, 53% use them in meetings or classes. If 10 adult smartphone users are randomly selected, find the probability that at least 3 of them... more
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Statistics Biostatistics

10/15/22

What is the probability of obtaining a sample mean smaller than 1.97 ounces?
 A small bag of Doritos has a mean weight of 2 ounces with a standard deviation of 0.1 ounces. A sample of 30 bags were randomly selected and their weight was measured.  What is the probability of... more
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Statistics Biostatistics

10/15/22

What is the standard deviation of the distribution of all possible sample means?
 The mean test score for all students in Math221 was 80 with a standard deviation of 14. If we took a random sample of 24 test scores, what is the standard deviation of the distribution of all... more
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Statistics Biostatistics

10/15/22

What can you conclude about the shape of the test score distribution?
The mean test score for exam 1 was 82, while the median was 88. What can you conclude about the shape of the test score distribution?
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Statistics Biostatistics

10/15/22

68-95-99.7 rule
 Olympic 100 meter dash times (measured in seconds) this year are normally distributed and have a mean time μ = 10.5 and a standard deviation of 𝝈 = 0.5. Use the 68-95-99.7 rule to... more
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Statistics

10/14/22

What is the probability that the sample proportion is between 0.22 and 0.49?
Based on historical data, your manager believes that 45% of the company's orders come from first-time customers. A random sample of 97 orders will be used to estimate the proportion of... more
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Statistics

10/14/22

Enter your answers as numbers accurate to 4 decimal places.
A particular fruit's weights are normally distributed, with a mean of 536 grams and a standard deviation of 10 grams.If you pick 24 fruits at random, what is the probability that their mean weight... more
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Statistics Math

10/13/22

Suppose that 𝑋 is normally distributed with mean 85 and standard deviation 19. A. What is the probability that 𝑋 is greater than 114.07?
Suppose that 𝑋X is normally distributed with mean 85 and standard deviation 19. What is the probability that 𝑋X is greater than 114.07?
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Statistics

10/12/22

If p(e)= 0.55, p(e or f) =0.85 and p(e and f) =0.05 find p(f)
Statistics
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Statistics Math

10/12/22

Greater than question and between question for The Sampling Distribution for Proportions
Thank you to whoever helps explain this to me, I tried looking at a few videos and examples from other sites but I can only go as far as P(Z> -7.8921)= 1-(-7.8921)=8.8921 I put in my answer in... more
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Statistics

10/11/22

The mean daily production of a herd of cows is assumed to be normally distributed with a mean of 31 liters, and standard deviation of 7.2 liters.
A.) What is the probability that a daily production is less than 29.7 liters ?B.) What is the probability that a daily production is more than 51.8 liters ?( Round 4 decimal )
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Statistics Finite Math

10/11/22

Could you help me with this? The question is too long to fit here.
The officers of a high school senior class are planning to rent buses and vans for a class trip. Each bus can transport 49 students, requires 2 chaperones, and costs ​$1,400 to rent. Each van can... more
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