The standard deviation of the certain distribution is 9, what is its variance?

Q: From past results, a professor knows that the test scores are normally distribution with a mean 78…

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Q: The scores on a standardised test are normally distributed with a mean of 95 and standard deviation…

A: Let X denotes the scores on standardized test. Given that X follows N(mean = 95, SD = 20), then Z =…

Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…

A: Formula : Let , mean = μ and standard deviation = σ The test score below 'a' standard deviation of…

Q: A "big-box" store sells a particular laptop, but has only four in stock. The manager wonders what…

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Q: The scores on a standardized test are normally distributed with a mean of 105 and standard deviation…

A: Here, mean is 105 and standard deviation is 10.

Q: Human heights are one of many biological random variables that can be modeled by the normal…

A: Given that Mean=M=176.7 Standard deviation=S=9.9

Q: The distribution for the time a patient of a medical center spends waiting for an appointment is…

A: Solution: Let X be the time a patient of a medical center spends waiting for an appointment. From…

Q: Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100 and standard…

Q: A golf club manufacturer claims that golfers can lower their scores by using the manufacturer's…

A: The following information has been provided: Score (old design) Score (new design) Difference =…

Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…

A: Given that, The scores on a standardized test are normally distributed with, Mean = 95 Standard…

Q: The scores on a standardized test are normally distributed with a mean of 80 and standard deviation…

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Q: what percent of the students scored higher than 68?

A: It is given thatMean, μ = 70Standard deviation, σ = 3Z-Score, Z = ( X - μ )/σwhere, Z be the…

Q: he distribution for the time a patient of a medical center spends waiting for an appointment is…

A: Given data,μ=35σ=12P(11<X<35)=?

Q: The scores on a standardized test are normally distributed with a mean of 105 and standard deviation…

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Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…

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Q: Fabienne found the standard deviation of the residuals to be 1.30. Explain this value in context.

A: The standard deviation of the residuals shows that how much the data points spread around the…

Q: tems produced by a manufacturing process are supposed to weigh 90 grams. However, there is…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: The scores on a test are normally distributed with a mean of 110 and a standard deviation of 22.…

A: Let X be the random variable from Normal distribution with mean (μ) = 110 and standard deviation (σ)…

Q: If an adult male is told that his height is within 2 standard deviations of the mean of the normal…

A: If an adult male is told that his height is within 2 standard deviations of the mean.

Q: The scores on a standardized normally distributed with a mean of 95 and standard deviation of 10.…

A: Standardized z-score:   The standardized z-score represents the number of standard deviations the…

Q: What is the mode of a distribution of scores for a variable measured by? What is the variance of a…

A: Let us take a small dataset with frequency distribution and understand all the terms with this…

Q: he scores on a standardized test are normally distributed with a mean of 105 and standard deviation…

A: Consider X be the random variable representing the he scores on a standardized test.    X is…

Q: On average a basketball player makes 71% of her free-throw shots. If she makes 7 free-throw attempts…

A: given data n = 7p = 0.71we have to find mean and sd of no. of successes.

Q: The distribution for the time a patient of a medical center spends waiting for an appointment is…

A: Given data, μ=35σ=12P(X>60)=?

Q: If the mean exam score of a class was 75%, with a standard deviation of 15%,what percent of students…

A: Given,mean(μ)=0.75standard deviation(σ)=0.15

Q: A normal distribution has a mean of 80 with a standard deviation of 20 what score separates the…

A: Let x be the score which follows normal distribution with mean 80 and standard deviation 20. The…

Q: The scores on a standardized test are normally distributed with a mean of 90 and standard deviation…

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Q: A random variable Y has normal distribution with a mean of 80 and a standard deviation of 15.  What…

A: Mean()=80Standard deviation()=15

Q: does the range and standard deviation remain unchanged because the addition of 7 is a constant so…

A: given data  mean = 74 median = 76.5 range = 65 standard deviation = 11 add 7 points to each score…

Q: The scores on a standardized test are normally distributed with a mean of 105 and standard deviation…

A: Let k is 0.6 standard deviation below the mean.  That means -0.6 is the z score of the value.…

Q: Adult Golden Retrievers have a mean weight of 64 pounds with a standard deviation of 8 pounds. If…

A: In this scenario, it is known that the  mean weight is 64 pounds with a corresponding standard…

Q: A manufacturer claims that the mean weight of its ice cream cartons is 10 ounces with a standard…

A: The random variable is weight of ice cream cartons. The population mean is 10 ounces. The population…

Q: The scores on a standardized test are normally distributed with a mean of 85 and standard deviation…

A: If X be the scores. It is known- X~N85, 202 where, m: mean = 85 s: standard deviation = 20

Q: 37 38 37 30 36 47 40 47 27 36 30 26 41 41 51 44 31 40 38 44 39 53 37 42 45 44 44 41 46 37 Do the…

A: We have given the data set of sample size 30. We have to calculate sample standard deviations. (b)…

Q: how do i find the standard deviation of this question?

A: Given data: 227 , 123. 102, 235, 250, 202, 243, 111 Range = Maximum value - Minimum value…

Q: The scores on a standardized test are normally distributed with a mean of 90 and standard deviation…

A: The test score is 0.6 standard deviations above the mean is obtained below: From the given…

Q: The scores on a standardized test are normally distributed with a mean of 85 and standard deviation…

A: Since z-score is a measure of how far the standard deviation is away from the mean (Above/below).…

Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…

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Q: If I have the variance of 36 and the standard deviation of 6, how do I calculate the range?

A: From the provided information, Variance (σ2) = 36 Standard deviation (σ) = 6

Q: A test score of 36 has an equivalent standard score (z-score) of -2.4. If the standard deviation is…

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Q: what is the mean and standard deviation of all z distributions?

A: Z is distributed as a standard normal variable.

Q: The scores on a standardized test are normally distributed with a mean of 80 and standard deviation…

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Q: Assume that an intelligence test scores are distributed normallt with a mean of 100 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: A normal distribution has a mean of 40 and a standard deviation of 5. 68% of the distribution can be…

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Q: he scores on a standardized test are normally distributed with a mean of 120 and standard deviation…

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Q: The song-length of tunes in the Big Hair playlist of a Statistics professor's mp3-player varies from…

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