Put values in x₁ and frequencies in y₁, then type total(x₁ * y₁) / total(y₁). That is a weighted mean, and it is also expected value. Statistics functions as a set are in Desmos statistics functions.
Table, then one line
Do not multiply each pair on scratch if the table will do it. Population standard deviation is a different leftover, in stdevp. Mean of an unweighted list is in mean, median, and mode.
The bottom line
total(x₁ * y₁) / total(y₁). Frequencies in the second column.
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