A wedding caterer randomly selects clients from the past few years and records the months in which the wedding receptions were held. The results are listed below (based on data from The Amazing Almanac). Assume that you want to test the claim that weddings occur in different months with the same frequency. Briefly describe what O and E represent, then find the values of O and E.

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Month Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Number 8 7 13 17 11 10 10 12 8 10