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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

    Normal Distribution Questions!

    Sachin, Do not waste yout time on my post,please. Thanks
  3. S

    How to get random variables according to cumulative probability?

    I have never studied statistic before and just tried to find some noemal exercise to help myself. So if you guys would like to help me I would say thanks, if not,your explaination make no sense at all. Thanks.
  4. S

    Normal Distribution Questions!

    I have already finished it. Thank you though..
  5. S

    How to get random variables according to cumulative probability?

    OR for example, the range of random variables? Thanks!
  6. 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...
  7. S

    What does one standard deviation mean?

    Thank you so much, Hui! Your explaination is clear and in detailed, which is very useful for me!
  8. S

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

    Hi Luke M, I do not understand that why using formula (C2-C10)^2*B2 and SQRT(SUM(D2:D8)/99) respevtively? Thanks!
  9. 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!
  10. 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%...
  11. S

    Count how often a value occurs?

    Yes,thats true. Thank you so much, SirJB7!
  12. S

    Count how often a value occurs?

    Hi,SirJB7! For "count" I mean how to count the number of this sample from this figure,i.e.the number of 33 students since there are only 10 rows in total. Also, from this figure there is no visable data showing the observation occurs most frequently either. So based on this figure, the...
  13. S

    Count how often a value occurs?

    Thank you, Sir JB7. Actually, these data are the only info. showed for this example and I do not understand what the column Sample mean? Are they the number of students? How come? Also, the explanation says it can be easily counted OR use the EXCEL function. And now besides using the...
  14. 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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