Mr. Jackson is looking at test scores for his Algebra 2 class. The scores on the Unit 2 Test follow a normal distribution, with a mean of 89 and a stan- dard deviation of 3. What percent of learners scored 86 or better?

Q: For a population with mean of 50 and standard deviation of 8, what is the Z-score that corresponds…

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Q: For a set of data that cannot be assumed to be distributed in a bell shape, approximately what…

A: Our aim is to find the percentage of values will be between the mean and two standard deviation.

Q: For a sample with M= 80, a score of X= 88 corresponds to z =2. what is the sample standard deviation…

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Q: 24. For a sample with a mean of M = 51, a score of X = 59 corresponds to z = .00. What is the sample…

A: Given that mean, M= 51 Score, X= 59  And z Score= 2  We've to find sample standard deviation. We…

Q: In a sample distribution, X=56 corresponds to z=1.00, and X=47 corresponds to z=-0.50. Find the mean…

A: Given,  X=56 corresponds to z=1.00 X=47 corresponds to z=-0.50 wktz=x-μσX=zσ +μ

Q: For a population with mean of 50 and standard deviation of 8, what is the z-score that corresponds…

A:

Q: For a sample with mean M=80,  a score of X=88 corresponds to z=2. What is the standard deviation?

A:

Q: Given that the mean for a data set is 24.8 and the standard deviation is 2.3, find the z-score of…

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Q: For a sample with a standard deviation S= 12, a score of X = 44 corresponds to a z = -1.00. What is…

A: The z-score of a random variable x is defined as follows: z = (x – x̅)/s. Here, x̅ and s are the…

Q: For example with m= 80, a score of x = 88 corresponds to z = 2.00.  What is the sample standard…

A: GivenMean(M)=80x=88z-score(z)=2.00

Q: has the value t = 2.24. If the standard deviation from the sample is 2.4, what is the mea %3D O 16 O…

A: The formula for test statistic is,

Q: A group of students take a Statistics Exam where the average was M = 90 and the standard deviation…

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Q: For a t distribution with 15 degrees of freedom, 90% of the distribution is within how many standard…

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Q: The results of a calculus exam are normally distributed with a mean of 76 and a standard deviation…

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Q: The sum of the squared deviation scores is SS = 20 for a sample of n = 6 scores. What is the…

A: The variance of the sample can be calculated as:

Q: On a college admissions test where the scores wereapproximately normally distributed, Amy’s score of…

A:

Q: Suppose that 35% of all adults in a population would say “good” and 65% would say “bad” if they were…

A: It is given that a sample of 1,000 adults from a population is randomly selected and the population…

Q: A group of students take a Statistics Exam where the average was M = 90 and the standard deviation…

A:

Q: A previous study claims that the average time a teenager spends browsing his social media accounts…

A: Sample size(n)=100 Population mean(μ)=6 Sample mean(x)=5.5 Standard deviation(σ)=0.5

Q: For a population with a standard deviation of o = 12, a score of X = 44 corresponds to z = -0.50.…

A:

Q: with a sample average of 80 and a raw score of 76. Would you prefer a standard deviation of s=2 or…

A: A standard deviation of s=2 is preferred.

Q: In the past Algebra classes, records show that the average score of the students in the mid-term…

A: As per our guidelines we can solve first three subpart and rest can be reposted. Solution-: Let, X=…

Q: The scores on a driver's test are normally distributed with a mean of 100. Find the score that is 3…

A: From the provided information, Mean (µ) = 100 Standard deviation (σ) = 28 X~N (100, 28)

Q: A group of students take a Statistics Exam where the average was M = 90 and the standard deviation…

A:

Q: Given that it is normally distributed with a standard deviation of 8.025 cm. The engineer rejected…

A: we have to find mean value for given data...

Q: In English class the final exam grades average 78 with a stanard deviation of 12 and in a…

A: Given data,   For English exam, μ=78σ=12Score x=84   For mathematics exam, μ=72σ=15Score x=82

Q: E (T; – T)² = 2535. in

A: Here's the explanation :- The standard deviation is a measure of the amount of variation or…

Q: Answer the following questions using the z-score chart( attached below) or by using a spreadsheet.…

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

Q: A distribution of exam scores has a mean of u=80. If your score is X=72, which standard deviation…

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Q: For a sample of n = 20 scores, X = 25 corresponds to z = -1.20 and X = 40 corresponds to z = +1.80.…

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Q: A sample of n = 25 scores has a mean of M = 40 and a standard deviation of s = 10. What is the…

A: Mean = 40 Standard deviation = 10 Sample size , n = 25

Q: A doctor measured serum HDL levels in her patients, and found that they were normally distributed…

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Q: On an exam with u=52 ,a person scores x=56.Which value for the standard deviation would give this…

A: We have given that,  Mean = 52 , X = 56 , We have to find z-score at  (1) sigma = 2  (2) sigma = 4…

Q: In a study where scientists wanted to compare two different techniques for measuring the amount of k…

A: From the given information, the claim of the problem is the true average difference between the…

Q: In a population with m=60, a score of X=58 corresponds to a z-score of z=-0.50. What is the…

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Q: Consider a normal distribution curve where 70-th percentile is at 11 and the 30-th percentile is at…

A: Given 70-th percentile is at 11, then…

Q: As shown in the previous question, the average number of siblings (sibs) is about 3.5, with a…

A: A continuous random variable X follows Normal distribution with parameters μ and σ2 if its…

Q: If scores are normally distributed with a mean of 35 and a standard deviation of 10, what percent of…

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

Q: For a population with mean of 50 and standard deviation of 8, what is the z-score that corresponds…

A: Given that , mean = μ = 50 standard deviation = σ = 8 x = 46

Q: suppose the average time to fill a routine prescription at a local pharmacy is 35 minutes based on…

A: Given data,Mean μ=35sd    σ=11x=48z=?

Q: sample with a standard deviation of s = 5, what is the z-score corresponding to a score that is…

A: z-score measures how many standard deviations below or above the population mean a raw score is.

Q: Alice was told that her reading test score was one standard deviation below to me if test scores…

A: Given that, Alice was told that her reading test score was one standard deviation below to me if…

Q: A normal distribution has a Mean of 25 and a S.D. of 10. Find the probability that the deviation…

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Q: It is given that the standard score is 2.8 and it is known that for the normal distributed data 52,…

A: The normal distribution  in the center are generally denser and basically less denser at tails.…

Q: For a population with mean of 50 and standard deviation of 8, what is the z- score that corresponds…

A:

Q: In a sample distribution, a score of x = 21 corresponds to z = -1.00 and a score of x = 12…

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: On an exam with u = 52, you have a score of X = 56. Which value for the standard deviation would…

A: We have given that µ = 52 x = 56 z-score formula is given as  z =( x - μ )/σ

Q: A test was given to 120 students, and the scores 8 approximated a normal distribution. If the mean…

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Q: A nurse at a local hospital is interested in estimating the birth weight of infants. How large a…

A: The following information has been provided: α=0.02,E=4,σ=5\alpha = 0.02, E = 4, \sigma = 5…

Q: For a population with a standard deviation of σ = 12, a score of X = 44 corresponds to z = −0.50.…

A: