Lily designs a rectangular tile structure for her kitchen. The top row of the structure will have 10 decorative tiles. The rest of the structure will have decorative tiles and standard tiles in a ratio of 3 decorative tiles for every 7 standard tiles

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.