5) Professor gives an exam and the class average is 75% with standard deviation of 5 Your grade is 85. Calculate your z – score and interpret it in the light of the Empirical Rule. What do you need to assume about the grades in order to use the Empirical Rule 6) Your z – score in a class in which the average is 80 with standard deviation of 10 is z = 1.6. What is your real test score?

Q: IQ scores are normally distributed with a mean of 67 and a standard deviation of 6. Find out the…

A: Given: X: IQ Scores

Q: A researcher claims that the yearly consumption of soft drinks per person is 52 gallons. In a sample…

A:

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: How do you find z-score with only a standard deviation and the simple mean? They aren't providing…

A: Let us assume we have a population which is normally distributed with mean µ and standard deviation…

Q: You are testing the claim that the mean GPA of night students is less than the mean GPA of day…

A:

Q: To compare the braking distances for two types of tires, a safety engineer conducts 35 braking tests…

A: Given that Type A n1 = 35 x1=42 σ1=4.7   Type B n2=35 x2=45 σ2=4.3   l.o.s.=α=0.10

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

A:

Q: JaJuan want to estimate the average student GPA at his high school. He surveys 37 students and finds…

A: Given,sample size(n)=37sample mean(x¯)=3.33population standard deviation (σ)=0.29

Q: What is the corresponding Z score ? Mean is 70, standard deviation is 10 and X= 89

A: We have to find z score.

Q: Suppose that you have a X= 75 on an exam with Ú=70. Which standard deviation would give you a better…

A: Given : Suppose that you have a X= 75 on an exam with Ú=70

Q: Suppose the mean IQ score of people in a certain country is 101. Suppose the director of a college…

A: Given Data: Null and Alternate Hypothesis: H0: μ=101HA: μ>101

Q: MAKE SURE YOU SELECT 2 ANSWERS FOR THIS QUESTION - Type of test and hypothesis. A meteorologist…

A: Given population mean μ=0.46  Population standard deviations σ=0.12

Q: Researchers measured the data speeds for a particular smartphone carrier at 50 airports. The highest…

A: Given: highest speed=74.3 mean(x)=15.94 s=22.26

Q: Suppose the mean IQ score of people in a certain country is 100. Suppose the director of a college…

A: Decision rule : Reject H0 if P-value  <  α Here  P-value = 0.023 < 0.1 = α.

Q: In an exam for a statistics class, the class average is 68 with a standard deviation 4. If a student…

A: Given mean μ= 68, standard deviation σ= 4 Let X: score of the students = 75

Q: How does one calculate the standard deviation?

A:

Q: I don't understand how to use the given information to answer the questions about the mean and…

A: Given probability distribution…

Q: You are testing the claim that the mean GPA of night students is different than the mean GPA of day…

A: Given the,  Sample size 1 , n1=35 X1 bar = 2.78 And standard deviation, s1= 0.79  n2 = 25 X2 bar=…

Q: The scores on a standardized test are normally distributed with a mean of 100 and standard deviation…

A: Given data,Mean μ=100sd     σ=15If z-score=0.8x=?

Q: What should the minimum IQ score be so that 90% of all students in the area can qualify for…

A: The value of z at the lowest 90%, i.e., corresponding to the left to the 90% area (p=0.90) of the…

Q: An exam score has a mean of 504 and standard deviation of 90.  What exam score coresponds to a…

A: given data, An exam score has a mean of 504μ=504standard deviation of 90.σ=90  exam score(x)…

Q: Q/ Find the following data (6, 8, 5 2, 4, 3, 7, 9) 1. Range. 2. Average absolute deviation. 3.…

A:

Q: Body temperatures are from a Normal Distribution with a mean of ?? = 97.8° and a standard deviation…

A: Givenmean(μ)=97.8standard deviation(σ)=0.8z-score=-1.25

Q: P(y>250) mean is 250 and standard deviation is 50

A: Given information- Population Mean µ = 250 Standard deviation (σ) = 50 We have to find P(y >…

Q: 2) A pharmaceutical testing company wants to test a new cholesterol drug. The average cholesterol of…

A: The population mean is 200 and population standard deviation is 25.

Q: he scores on a standardized test are normally distributed with a mean of 115 and standard deviation…

A: The scores on a standardized test are normally distributed with Mean = 115 Standard deviation = 20

Q: The mean score for first exam in your first organic chemistry class (section A) was 60, with a…

A: The score on the exam is denoted by X. In the given problem, mean score is 60 and the standard…

Q: The average score on the Stats midterm was 71 points with a standard deviation of 5 points, and…

A: Given that mean = 71 and SD = 5 And the z score is given by Z = 1

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

A: Here we need to find the score corresponding to  z = 2.2 standard deviations above the mean. Mean is…