what is a class interval?

I have a homework sheet and it says to draw a frequency table that contains a set of results using class intervals of 5 seconds? Help anyone?

so the interals will be things like 0 - 5 seconds, 6-10 seconds 11-15 seconds etc then for each of those 'intervals' you put in how many times that a result occurs in each of those intervals i.e. the 'frequency'
15 March 2011
i still dont understand the frequency part..sorry, can you help me please.
15 March 2011
Frequency is the number of occasions the data occurs in the intervals.
15 March 2011
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