On a recent quiz, the class mean was 71 with a standard deviation of 3.2. Calculate the z-score (to 4 decimal places) for a person who received score of 72. Z-score: Is this unusual? O Not Unusual O Unusual

Q: The ACT is an exam used by colleges and universities to evaluate undergraduate applicants. The test…

A: Given,mean(μ)=22.2standard deviation(σ)=4.9

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Q: On a nationwide math test, the mean was 51 and the standard deviation was 4. If Roberto scored 70,…

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Q: In a sample of 152 people the average score was 74 with a standard deviation of 6. What is the…

A: Sample size = n = 152   Mean = 74  Standard deviation = 6

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A:

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Q: help please answer in text form with proper workings and explanation for each and every part and…

A: Solution of the given question is like

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A: X follows a Normal distribution with mean = 100 and S.D = 15 Then z=(x-mean)/SD = (x-100)/15…

Q: Anna Grace took the ACT and got a score of 31 on the math portion of the exam.  The scores are…

A: Proportion of students Anna Grace scored lower than is 0.0047 (0.47%).

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Q: Is there a doctor in the house? A market research firm reported the mean annual earnings of all…

A: GivenMean(x)=192890sample size(n)=47standard deviation(s)=43117α=0.01

Q: You are are running some stats on final game scores during March Madness games. The 16 teams that…

A: given data μ = 70.8σ = 12.4x = 80z = ?

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Q: The GMAC Insurance company reported that the mean score on the National Drivers Test was 67.5 with a…

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Q: Laura learned that the average GPA in her school is 3.6 with a standard deviation of 0.3. If her GPA…

A: From the given information,   Mean = 3.6 Standard deviation = 0.3   The objective is to find the…

Q: Decide if the following statement is true or false. Explain why. It is possible to have a standard…

A: We need to decide if the given statement that " It is possible to have a standard deviation of -2…

Q: 0.2743 d.)

A: For a random variable, X~N(μ,σ2), the z-score is, Z=X-μσ    .... (1)where, μ=population…

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

A:

Q: On a standardized exam, the scores are normally distributed with a mean of 120 and a standard…

A: Mean(μ)=120 Standard deviation(σ)=10 Raw score(X)=115

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Q: Calculus I scores at College A have mean 70.21 and standard deviation 15.32; Calculus I scores at…

A: Calculus I scores at College A have mean 70.21 and standard deviation 15.32;Calculus I scores at…

Q: The average American spends 25 hours a week on the Internet. Assume the times are normally…

A: From the given information, μ=25σ=4.5

Q: The IQ score that separates the bottom 15% from the top 85% is P,5 =. (Round to the nearest…

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Q: A population has mean 27 and standard deviation 12 . What is the data value that has a z-score of -2…

A: Given data, Mean=27 sd=12 z=-2 x=?

Q: On a nationwide math test, the mean was 72 and the standard deviation was 7. If Roberto scored 90,…

A: Given that, Mean = 72 Standard deviation = 7

Q: The area of the shaded region is (Round to four decimal places as needed.)

A: mean = 100 standard deviation = 15

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A: Note: Hi! Thank you for the question. As you have posted multiple sub-parts, according to our…

Q: Which test was better?. Gina took a midterm in her math class and her biology class. After she gets…

A: The objective is to calculate z score for math test for Gina. we have given  x=47 mean(x)=39…

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A: Given: Population mean (µ) = 10.75 Population standard deviation (σ) = 2.40 z-score = 1.36

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A: Given Mean=2 x-bar=1.99 Standard deviations=0.3 n=62

Q: On a nationwide math test, the mean was 57 and the standard deviation was 4. If Roberto scored 90,…

A: Formula for z-score is

Q: A sandwich shop claims to sell sub sandwiches that are 12 inches lona. An employee is a little…

A: We have given information, μ=12 inches n=45 x¯=12 inches s= 18 inches

Q: 8. Using Minitab to illustrate the Central Linmit Theorem (CLT), the CLT tells us about the sampling…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: In a statistics class of 150 students, the mean and standard deviation of scores was 70 and 5,…

A: Given: The total number of students are N=150. The mean scores of students in a statistics class is…

Q: Many students did an exam, the mean was 15 and the standard deviation was 32 The highest mark was…

A: Given Mean μ=15, standard deviation σ=32  X=103

Q: standard deviation

A: If the random variable X follows a distribution with mean = μ and standard deviation = σ Then the Z…

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A: Answer Mean [μ] =15Standard deviation [σ ] =0.10It is more than 4 standard deviations..

Q: In a calculus class, Jack scored a 9 on a quiz for which the class mean and standard deviation were…

A: We have to find who had done better.

Q: 3. In the population, the average IQ is 100 with a standard deviation of 15. A team of scientist…

A: Given information: x=140μ=100s=15n=35

Q: A manufacturer of bolts has a quality-control policy that requires it to destroy any bolts that are…

A: The question is about probability distribution.Given :Mean length of the bolts ( ) = 13 cmStandard…

Q: The GMAC Insurance company reported that the mean score on the National Drivers Test was 77.8 with a…

A:

Q: Determine the class average if the standard deviation was 8% and Henry’s mark of 85% is equivalent…

A: Given that,  The standard deviation =8%, Marks of Henry's =85%, and z-score =1.30.