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I know I have to organize them from least to greatest right?

yes.
for the grouped frequency distribution, how many intervals are needed?

110,110,110,111,112,112,113,114,115,115,116,116,118,118,118,120,121,123,124

I am going to say 4?

|dw:1354405916219:dw|

is there any formula for this number of intervals?

I don't follow if there is I can't remember what the formula is?

the general rule is to use not too few and not too many intervals. so 4 is okay me.

|dw:1354406677376:dw|

does that look right?

nope. the sizes are different. try 110-113, 114-117,118-121, 122-125

okay it will be the numbers though right?

X F
-----------------
110 - 113 7
114 - 117 5
118 - 121 5
122 - 125 2

That looks better

=)