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?

Answers
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'
chloe
15 March 2011
i still dont understand the frequency part..sorry, can you help me please.
caralanney
15 March 2011
Frequency is the number of occasions the data occurs in the intervals.
jon.ellis
15 March 2011
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