text: I have taken courses in introductory statistics and reliability engineering (which is basically statistics applied to engineering system reliability).  Give me a second to grab a few pieces of information and I will get back to you.\n\nOk, an overview of the exponential distribution:\nThe exponential distribution can model processes with a constant occurrence rate (let's call the ocurrence rate "a").  The pdf for the exp. distribution is pdf = a*e^(-a*t) and the cdf = 1-e^(-a*t).\n\n"What would be the Mean? Std.Dev=Mean?"\nBoth the mean and the standard deviation are equal to 1/(occurrence rate) for the exponential distribution.\n\nmean = std. dev. = 1/a  \n\nIn your data the ocurrence rate appears to be about (5 ocurrences)/(14 minutes) = 0.36 (ocurrences/minute).  The problem is that the time between ocurrences in your data sample isn't quite evenly spaced, but it is close. \n\nmean = std. dev. = 1/0.36 = 2.8 minutes\n\n"How can I get my X from this table?"\nI am not sure what X is supposed to represent.  I may have learned a somewhat different notation for this.\n\n"How can I build a frequency table from this information?"\nA frequency table just shows the number of occurrences in a certain time frame.  So, you can divide up your time intervals into equally spaced bins and see how many occurrences are in each interval.  Then make a table out of that.\n\n"How can I calculate quartiles with this info?"\nI am not sure on this one.