GDC TI-82 STATS Problem?

I try to calculate a single statistical data through 1-Var Stats in my GDC, Texas Instruments TI-82. This problem never occurred to me before as I fill in L1 with the number of data and L2 with the number of frequencies from each data. When I press 1-var Stats however, the results only calculates the L1 data and ignores L2 data completely, which is crucial since L2 represents the frequency of the data. Can someone tell me how I can fix this in my GDC? Thank you for any detailed answer.