A normal distribution has a mean of u= 80 with a= 20. What score separates the lowest 30% of the distribution from the rest of the scores? Oa X- 69.6 O b. X- 90.4 O. X- 50 O d. X- 110

Q: According to the empirical rule for population data that form a normal distribution, what percentage…

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Q: above the population mean a raw score is. Then what z-score value separates the highest 70% of the…

A: Given that  Z-score is a measure of how many standard deviations below or above the population mean…

Q: For a Normal Distribution, what's the probability of selecting a z-score that is greater than z =…

A: P(z>1.64)=?

Q: For a normal distribution with µ = 100 and o = 10, what percentage of scores have values less than X…

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Q: In a normal distribution, what percent of the data lie a. within 3 standard deviations of the mean?…

A: As per empirical formula i) 68% of data falls within the first standard deviation from the mean. ii)…

Q: A population of scores forms a normal distribution with a µ = 80 with o = 12. For a sample of n =4,…

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Q: Approximately what percentage of the scores in a normal distribution lie between Z = -1 and Z= -2?…

A: Given, z= -1 and z = -2. The percentage of scores in a normal distribution lie between z=-1 and z=-2…

Q: An IQ of 140 is converted into a z-score of z=1.40. what proportion of the normal distribution is…

A: Given : An IQ of 140 is converted into a z-score of  Z = 1.40

Q: What percent of the total population is found between the mean and the z-score given? (Use the…

A: Solution

Q: The mode of a normal distribution is 65.5 and the standard deviation is 8.4. Then, what is the…

A: Given that, The value of mode is, 65.5 The value of standard deviation is, 8.4

Q: In a normal distribution, what z-score cuts off the top 95% of the distribution? a. z = 1.65 b. z =…

A: Given the top 95% of the distribution

Q: The time that a customer takes to complete a transaction in the business line at the bank follows a…

A: Let X be the time that a customer takes to complete a transaction in the business line at the bank…

Q: Use the standand normal distribution table to determine the percent of data less than z= 1.53 The…

A: P(z<1.53)=?

Q: D. pl-H.20 <26-0.80

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Q: In a normal distribution, what z-score cuts off the top 95% of the distribution? z = 1.65…

A: Given Top 95 % distribution

Q: Heights of 10 year old children, regardless of sex, closely follow a normal distribution with mean…

A: X follows a Normal distribution with mean = 54.8 and S.D = 7 Then z=(x-mean)/SD = (x-54.8)/7…

Q: A normal distribution of test scores has a mean of 38 and a standard deviation of 6. What percent of…

A: The distribution of X is given as, X~N(µ=38, σ=6).

Q: 18. What percentage of a normal distribution is within 2 standard deviation of the mean? A. About…

A: Hello. Since your question has multiple, we will solve first two question for you. If you want…

Q: Use the normal distribution of SAT critical reading scores for which the mean is 508 and the…

A: Given that X follows Normal distribution with mean = 508 and SD = 116, then Z = (X - mean)/SD = (X -…

Q: average score of students taking a statistics final was 80 with a standard deviation of 7. assuming…

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Q: The median of normal distribution is 58. Then, what is the mean of the distribution? O a. 0 O b.…

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Q: The median of a normal distribution is 60. Then the mean of the distribution is O a. 60 O b. 0 O c.…

A: From the given information, The median of the normal distribution is 60.

Q: A researcher expects a treatment to produce an increase in the population mean. Assuming a normal…

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Q: d. The 90th percentile of a normal distribution is how many standard deviations above the mean? e.…

A: a) Let X represent the normal distribution P(X&lt;y)=0.9P(z&lt;y-μσ)=0.9Using standard normal…

Q: The proportion of observation from a standard normal distribution that take values less than 1.5 is…

A: P(Z&lt;1.5)=?   By using standard normal table the probability for 1.5 is  0.9332.   P(Z&lt;1.5)=…

Q: A population of scores forms a normal distribution with a mean of ?= 80 and a standard deviation of…

A: Solution: Let X be the score. From the given information, X follows normal distribution with mean…

Q: The mean and mode of a Normal distribution is 65.7, Then the median of the distribution is a. 75.6…

A: The mean and median of normal distribution is 65.7.

Q: Approximately what percentage of the scores in a normal distribution lie between Z = -1 and Z=-2? 2%…

A: P(-1&lt;Z&lt;-2)=?

Q: What proportion of scores in a normal distribution is below Z = -0.75? Group of answer choices

A:

Q: Use the normal distribution to the right to answer the questions. (a) What percent of the scores are…

A: From the given information, µ = 20.2 and s = 5.1. Let the random variable X denote the score of a…

Q: In a normal distribution, what z-score cuts off the top 15% of the distribution?

A: We will use Standard Normal table to determine the required z-score.

Q: (e) What is the distribution of X? () What is the probability that the total scores of 100 students…

A: It is given that mean is 520 and the standard deviation is 115.

Q: Scores on the SAT form a normal distribution with a mean of µ = 500 with σ = 100. If the state…

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Q: The mode and mean of a normal distribution is 45. Then, the median of the distribution is O a. 22.5…

A: Given information: Mean=45, Mode=45 All the normal distributions are symmetric around their mean.…

Q: Suppose a normal distribution has a mean of 38 and a standard deviation of 2. What is the…

A: Let X be the random variable from normal distribution with mean (μ) = 38 and standard deviation (σ)…

Q: What percentage of a normal distribution cooresponds to z scores greater than +0.63?

A: Here use standard normal distribution. Z is standard normal random variable.  Use excel command for…

Q: A normal distribution ha s a mean of µ = 40 with σ = 10. What proportion of the scores in this…

A: From the provided information,

Q: How do you find the X value that corresponds to a given percentile of the normal distribution? Find…

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Q: Draw a vertical line through a normal distribution for each of the following z-score locations. Find…

A: a)  z = 1.80

Q: Use the normal distribution to the right to answer the questions. Standardized Test Composite Scores…

A:

Q: The graph shows the distribution of times (in hours) that teenagers spend playing video games per…

A: Solution: Let X be the time that teenager spend playing video games per week. From the given…

Q: The IQ of a person follows a normal distribution and has a mean of 100 and a standard deviation of…

A: Option A is correct.

Q: The Mathematics section of the ACT test had a mean of 20.9 and an SD of 5.3 for the years 2013–2015.…

A:

Q: A normal distribution has a mean of 132 with a standard deviation of 28. By the Empirical Rule…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: The length of human pregnancies from conception to birth approximates a normal distribution with a…

A: We have to find given probability..

Q: Minister of Education Inese Puuce measured the English test scores of every child in the Grand Duchy…

A:

Q: The length of human pregnancies from conception to birth approximates a normal distribution with a…

A:

Q: The speed limit of a road is 65 miles per hour. The speed of a car on the highway follows a normal…

A: The normal distribution: A continuous random variable X is said to follow normal distribution if the…

Q: The median of a normal distribution is 60. Then the mean of the distribution is O a. 0 O b. 60 O c.…

A: Answer : The mean of normal distribution is : (b) 60.