Purchase Solution

Standard deviation

Not what you're looking for?

Ask Custom Question

Please use MINITAB to solve or explain how I can use MINITAB to solve.

7. Assume that the midterm's scores X are normally distributed. Let X have a mean of 72 and a standard deviation of 12. Then answer the following three questions:

a. What is the probability of obtaining a score at least 90?
b. What is the probability of obtaining a score at most 75?
c. What is the probability of obtaining a score between 60 and 79?

Purchase this Solution
Solution Preview

Cumulative Distribution Function
<br>
<br>Normal with mean = 72.0000 and standard deviation = 12.0000
<br>
<br> x P( X <= x )
<br> 90.0000 0.9332
<br>
<br>SO Prob of at least 90 = 1 - .9332
<br>
<br>Cumulative Distribution ...

Solution provided by:
Gaurav Agarwal, MS
Education
  • BE, Bangalore University, India
  • MS, University of Wisconsin-Madison
Recent Feedback
  • "Your explanation to the answers were very helpful."
  • "What does 1 and 0 means in the repair column?"
  • "Went through all of the formulas, excellent work! This really helped me!"
  • "try others as well please"
  • "Thank you, this helped a lot. I was not sure how to plug in those numbers to a formula. This was a great help. Now I have to figure out how to explain cost of capital is used in net present value analysis, and how cost of capital is used in net present value analysis. This stuff gets confusing."
Purchase this Solution
Free BrainMass Quizzes
Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

View More Free Quizzes
Related BrainMass Solutions

  • Six Sigma and Process Development/Measurement

    Mean = 55 Standard Deviation = Variance^0.5=4^0.5=2.0 USL = 55+4=59 LSL=55-4=51 Cp = Tolerance / (6*standard deviation) = (USL-LSL)/standard deviation Cp=(59-51)/(6*2)=0.667 Cpk = Minimum of (USL-mean)/(standard deviation*3) and (mean-LSL)/(standard

  • Standard Deviation and Risk

    478336 Standard Deviation and Risk What is the importance of the standard deviation in interpreting and drawing conclusions about risk?

  • Stock Variance

    497500 Stock Variance Standard Deviation The standard deviation of the market index portfolio is 20%. Stock A has a beta 1.5 and residual standard deviation of 30%.

  • Finding the Standard Deviation of a Portfolio Using Beta

    deviation of security or portfolio / Standard deviation of the market .60 = standard deviation of security or portfolio / .15 .09 = standard deviation of security or portfolio Thus, the standard deviation of the first portfolio is 9 percent.

  • Statistics Multiple Choice

    1. population standard deviation = 5 2. population standard deviation = 10 3. cannot determine from the information given 4. population standard deviation= 1.

  • Stock valuation/standard deviation/beta

    Beta is calculated as Beta of security = [Correlation X Standard Deviation of Security)] / Standard Deviation of market We are given correlation = 0.6, Standard deviation of security = 15% and Standard Deviation of market (S&P 500) = 18% beta of

  • Standard Deviation in a Gambling Scenario

    It is also likely that the one with larger standard deviation plays fewer times than the one with smaller standard deviation. Normally, a risk averse person would select a smaller standard deviation.

  • Standard deviation of return for a portfolio

    259501 Standard Deviation of Return for a Portfolio Stock X has a standard deviation of return of 10%. Stock Y has a standard deviation of return of 15%. The correlation coefficient between stocks is 0.5.

  • Standard deviation of returns

    183966 Standard deviation of returns on the fund and the standard deviation of market returns Suppose that a mutual fund has a beta equal to 0.75.

  • What weakness of the standard deviation is overcome through the use of the coefficient of variation?

    When using standard deviation, we know that the units of the standard deviation are the same as the population. In the original data, if we use X units then the standard deviation applies to those X units.

View More Related Solutions