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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!

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

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.

I have already finished it. Thank you though..

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

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...

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

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

Thanks Luke M!

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!

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%...

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

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...

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...

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...