What are the usual standard deviation measurements of a toy marble?

This is for my statistics class and I need to know what are the upper and lower limits of a standard marble toy. We have used 2/3in(15mm) marble balls so if anyone could point me in the right direction of searching these acceptance limits, it would be much appreciated.|||I don't think there are any standards for marble toys, its not like if there were parts of any other device or someones lives depended on it. There are probably a few producers of marble toys around but each of them might make different sizes of balls, though the differences in size between balls form one producers should not be measurable (unless you have a laser or some other sophisticated device). Eventually a producer might decided to make different sizes, still with a very little difference between marbles of one size.


I guess the sizes are made up by the ones that set the production, the limits are the cost and practicality, it would be hard to play with to small or to heavy balls so most of them are within some practical limits.


You could try to contact a marble balls producer to get some details.|||each brand is likely going to have a different standard deviation. for your assignment, it would be safe to to assume a standard deviation that seems reasonable. Just make sure you note wwhat stanfdard deviation you used, or alternatively, have you learned yet any way to determine the conservative estimate of an unknown standard deviaiton yet?|||It depends entirely on the manufacture process. This is the sort of thing you collect and use data to find out.





Many companies aim for a certain mean and standard deviation (for example, if a company has stated a mass on a product it is likely that they have set the mean of product masses higher, considering a standard deviation, to ensure most products are above the stated amount). However, I doubt this information would be accessible, simple or any type of standard.