Question

Asked Jul 8, 2019

23 views

Exam grades: scores on a statistics final in a large class were normally distributed with a mean of 75 and a standard deviation of 9.

Part D: Between what two values are the middle 60% of the scores?

***Need help with figuring out how to find the two values you plug in for the area of invNorm to get the final answer on a TI-84.**

Step 1

Let *X* be the scores on statistics final, which is normally distributed with mean = 75 and standard deviation = 9.

It is known that, in a normal distribution, there is equal area above and below the mean value.

Thus, P(X > 75) = 0.5 and P(X < 75) = 0.5

It is required to find the x values such that, P(x1 < X < x2) = 0.60

As the area covered is middle 60%, P(x1 &...

Tagged in

Find answers to questions asked by student like you

Show more Q&A

Q: The point on a normal distribution (mean equals 6 and standard deviation equals 9) that is greater t...

A: The given information is that the scores distributed normally with mean 6 and standard deviation 9.F...

Q: Monica takes one hour to wash a car and Hilary takes one hour to wash a car. If they work together,...

A: Let Monica and Hilary can complete the work in x hours if they work together.Washing a car can be de...

Q: Consider a drug that is used to help prevent blood clots in certain patients. In clinical trials, am...

A: Test statistic calculation:The test hypotheses are:Null hypothesis:H0: p = 0.03, that is, 3% in the ...

Q: The market firm salary.com reported that the mean annual earnings of all family practitioners in the...

A: A. Hypotheses:Denote µ as the population mean salary for family practitioners in LA. The claim is th...

Q: An economist is studying the job market in Denver area neighborhoods. Let x represent the total numb...

A: Scatter PlotIt is a Graph between two variables. It is plotted to check the relationship between the...

Q: - A study was done using a treatment group and a placebo group. The results are shown in the table. ...

A: (a)The provided image does not have the question for subpart (a), since the claim is not known, the ...

Q: Please answer the whole question. (1) Let x be the age in years of a licensed automobile driver. Le...

A: (e) The value of coefficient of determination:The given data is represented in the following table:

Q: How do I run a the test of normality? Assumptions of normality

A: Introduction:Several tests of normality exist, using which you can verify whether a particular data ...

Q: A cell phone manufacturer claims that the average battery life of its newest flagship smartphone is ...

A: Given Null Hypothesis Ho : µ = 20Alternative Hypothesis Ha : µ < 20Sample size n = 3Sample mean =...