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  1. S

    What does this mean?

    For a sampling plan of sampling 100 bottles each time, 10% of the time the sample mean will be more than what value? ESP,10% of the time means the upper tail, the lower tail or the middle part? Thanks!
  2. S

    How to get random variables according to cumulative probability?

    OR for example, the range of random variables? Thanks!
  3. S

    Normal Distribution Questions!

    A supplier contract calls for a key dimension of a part to be between 1.9 and 2.1 cm. That is, a part will not be accepted if the dimension is out of the specified limits. The supplier has determined that the standard deviation of its production process is 0.10 cm. The process is normally...
  4. S

    How can I get the mean and SD with midpoint and relative frequency?

    For example: Age Group Percentage 0-24 34.0% 25-34 13.1% 35-44 13.9% 45-54 14.5% 55-64 11.2% 65-74 7.1% 75+ 6.3% Assume the midpoint of 75+ group is 81 Thanks!
  5. S

    What does one standard deviation mean?

    Here is an example: FIRM A FIRM B MEAN $531.94 $24.83 STD DEV $60.97 $1.13 CV $0.115 $0.046 In this case, what would be teh percentage loss to the invester if each stock's prica falls by ONE standard deviraton? THE ANSWER are 11%...
  6. S

    Count how often a value occurs?

    The textbook says there is a sample of 33 students, but I cannot count the the number of 33 from the figure. Here is the part of the figure. How can I get the the Sum and Mode from the figure? Thanks! Sample Hours online/week 1 4 2 2 3...
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