When is the mean a poor description of a frequency distribution? A. When the distribution has a small standard deviation. B. When the distribution is normal. C. When the distribution has extreme values.

Q: 11. In a normal distribution, approximately 95% of the data are contained within one standard…

A: 11. Empirical Rule: 68% of the values lies between one standard deviation from the mean. 95% of the…

Q: A symmetric frequency distribution has identical mean, median and mode measures True O False

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Q: According to the Empirical Rule, the percentage of observations in a data set (providing that the…

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Q: Suppose that ?, the rent of a one-bedroom apartment in Edmonton, follows a distribution with a mean…

A: Let X be the rent of one - bedroom apartment in Edmonton which follows a distribution with mean (µ )…

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: The question is about hypo. testing Given : Popl. mean amount of wireless data used by teenagers ( μ…

Q: A set of data items is normally distributed with a mean of 500. Find the data item in this…

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Q: consider a normal distribution with a mean of 500 and a standard deviation of 50. a. Below what…

A: Data given  X~N(μ=mean=500, standard deviation=σ=50)

Q: A uniform distribution has endpoints 4 and 18. A. What is the mean? B. What is the standard…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: Suppose that the price of an item is normally distributed with mean 50 and standard deviation 10…

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Q: In a Normal distribution 7% items are under 35 and 89% are under 63. Find its mean and standard…

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Q: In a distribution exactly normal, 7% of the items are under 35 and 89% are under 63. What are the…

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Q: Suppose a normal distribution has a mean of 98 and a standard deviation of 6. What is P(x2 104)? A.…

A: We have given that.   X~N( μ , ?^2 )   μ=98   , ?=6   Z-score =( x - μ )/?

Q: If the weights of 1,000 adult men in a county are plotted on a histogram, which curve is most likely…

A: For large n we use normal approximation.  And normal distribution shape is like bell.

Q: The empirical rule relates the standard deviation of a population to the probability of where a data…

A: The given statement  rule relates the standard deviation of a population to the probability of where…

Q: For any normal distribution, about 68 % of the data lie within one standard deviation of the mean.…

A: The empirical rule, also referred to as the three-sigma rule or 68-95-99.7 rule, is a statistical…

Q: In a normal distribution, 99.7% of the data fall within how many standard deviations of the mean? A.…

A: Solution-: In a normal distribution, 99.7% of the data fall within how many standard deviations of…

Q: A symmetric frequency distribution has identical mean, median and mode measures True False

A: We have given that an statement about the symmetrical distribution.

Q: Below is the graph of a normal distribution with mean = standard deviation o = 84 and 2.4

A: Given Information: A graph of a normal distribution with mean μ = 84 and standard deviation σ=2.4 To…

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: State the null and alternative hypotheses for the test. Fill in the blank below. H0: μ=6:…

Q: d) Find the cut-off for the top 30% of electricity usage in a 4 person household. e) What is the…

A: Given a Uniform distribution : Lower limit = a = 857 Upper limit = b = 945   d) We need to find x…

Q: For data that is normally distributed, is it possible for the standard deviation to be larger than…

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Q: A normal distribution has a mean of 100 and a standard deviation of 10. What percent of data values…

A: The formula for z score is,  The probabilities is computed by using the standard normal table.

Q: For the binomial​ distribution, which formula finds the standard​ deviation?

A: Consider the terms for any binomial distribution.

Q: Which of the following statements is true regarding of the value that corresponds to the decile 6 of…

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Q: A normal distribution curve has an egg shape when plotted. O True O False

A: Normal Distribution Curve The normal distribution is a symmetrical distribution function on both…

Q: In a normal distribution, about what percent of the data lies within one, two, and three standard…

A: We have to determine the percentage between (mean - SD, mean + SD), (mean - 2SD, mean + 2SD) and…

Q: For a certain normal distribution, the first moment about 10 is 40 and the fourth moment about 50 is…

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Q: A researcher wishes to determine how much money per week is spent on groceries in a small Western…

A: Given : ME< 3.0 σ= 18.0 At 98.0 % confidence level , z score= 2.326 Need to find the minimum…

Q: The Bun-and-Run is a franchise fast-food restaurant located in the Northeast specializing in…

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Q: Based on the graph of this normal distribution. a) The mean is _____ .  b) The standard deviation…

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Q: f mean = 25, median = 30, and standard deviation = 15, the distribution will be: (a) Symmetrical (b)…

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Q: The sample standard deviation follows a normal distribution if the population follows a normal…

A: We know that- The population follows a normal distribution with mean and standard deviation, the…

Q: The empirical rule relates the standard deviation of a population to the probability of where a data…

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Q: A. In a normal distribution, 84.13% of items are under 24 and 10% of items are over 25. Find the…

A: Hi! Thank you for the question As per the honour code, We’ll answer the first question since the…

Q: On a normal distribution, at what percentage must a. The mean fall? b. The median fall? c. The…

A: Normal distribution, also known as the Gaussian distribution, is a probability distribution that is…

Q: Suppose that the distribution of scores on an exam can be described by a normal curve with mean 110.…

A: Let X be the score in the exam. Given, X~Nμ=110,σ2. 90 is the 16th percentile. Thus…

Q: Suppose a normal distribution has a mean of 50 and a standard deviation of 3. What is P(x≤ 47)? OA.…

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Q: The following graph shows that the normal distribution A has greater variability than the normal…

A: Solution Z be standard normal variate with mean 0 and sd 1

Q: Suppose that the distribution of scores on the Graduate Record Exam (GRE) is approximately normal,…

A: a. Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: A population is normally distributed with a mean of 51 and a standard deviation of 12. (a) What is…

A: (a) Obtain the mean of the sampling distribution for the given population. The mean of the sampling…

Q: In a normal distribution, find the proportion of the population within three fifths of a standard…

A: We have to find out given proportion..

Q: In a job fair, 5,000 applicants applied for a job. Their mean age was found to be 28 with a standard…

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Q: Suppose a normal distribution has a mean of 79 and a standard deviation of 7. What is P(xs 93)? O A.…

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Q: The z-score measures how many standard deviation a given value is above or below the mean. True or…

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Q: A set of final examination grades in an introductory statistics course is normally​ distributed,…

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Q: What is the z-score of x = 3 if it is 2 standard deviation to the left of the mean? O -3 O -2 O -1 O…

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Q: Suppose a normal distribution has a mean of 79 and a standard deviation of 7. What is P(xs 65)? O A.…

A: Normal distribution has mean =79 and SD = 7, p(X<=65) = ?

Q: 2. For the households income distribution in 1 above, which of the following is the most suitable…

A: It is a basic fact of central tendency. It is widely used in statistics.

Q: Durations of clinical research studies awarded by a particular federal agency are assumed to follow…

A: It is given that the duration follows normal distribution with mean 24 and standard deviation 2.5.…

Q: Sketch a normal distribution/bell curve with a mean of 60 and a standard deviation of 20. What…

A: Let X be the random variable from normal distribution with mean (μ) = 60 and standard deviation (σ)…