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There were a total of 82 slices sold today (4+36+20+6+16). The probability of the first slice being cheese pizza would be the number of cheese slices sold divided by the total number of slices sold: 20/82 or approximately 0.244 or 24.4%.
Therefore, the experimental probability that the first slice sold during lunch tomorrow will be a slice of cheese pizza is 0.244 or 24.4%.