8,918 Answered Questions for the topic statistics

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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10/11/22

Mixed in a drawer are 2 blue​ socks, 4 white​ socks, and 6 gray socks. You pull out two​ socks, one at a​ time, without looking. Find the probability of getting 2 socks of the same color.
Thank you for helping!
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Statistics Probability

10/11/22

Please help me to find the probability of this question
Suppose that about 85% of graduating students attend their graduation. A group of 21 graduating students is randomly chosen.Find the probability that 15 or 16 attend.
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Statistics Probability

10/11/22

Please help me find the probability of this questions

It has been estimated that only about 30% of California residents have adequate earthquake supplies. Suppose you randomly survey 11 California residents. We are interested in the number who have... more
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Statistics

10/11/22

Normal Distribution: Finding probability using tables
For a standard normal distribution, find:P(z < 0.11)Round to 4 decimal places
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Statistics

10/11/22

A statement that “the 95% confidence interval for the population mean is (275, 325)" means that 95% of the population values are between 275 and 325. Is this true/false? & Why?
I think the statement is false but I am not sure so I can't come up with a reason/rationale. Thank you
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Statistics Math

10/11/22

Need Help ASAPP!!
A distribution of points scored per basketball game for college athletes has a  σ=4. Find the z-score for a score that is:a) 4 points above the mean   z =  b) 12 points above the mean  z =  c) 2... 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 daily production is less than 29.7 liters ?B.) What is the probability that daily production is more than 51.8 liters ?
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Statistics

10/11/22

approximately normally distributed with a mean of 53.6 inches, and standard deviation of 2.2 inches.
In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a mean of 53.6 inches, and standard deviation of 2.2... more
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Statistics

10/10/22

Find the value separating the bottom 40% values from the top 60% values. Find the sample mean separating the bottom 40% sample means from the top 60% sample means.
A population of values has a normal distribution with μ=113μ=113 and σ=89.3σ=89.3. You intend to draw a random sample of size n=198n=198. Please answer the following questions, and show your... more
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