A computer program selects blue, red, green as the background color each time the program is used. The program was used 45 times on the same computer in one week. Of those 45 times, a blue background appeared 12 times and a red background appeared 21 times.

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.