Final answer:
The probability that Chris does not win the prize is 231/250 or 0.924, meaning there is a 92.4% chance that he does not win.
Step-by-step explanation:
The question at hand requires calculating the probability that Chris does not win a prize in a raffle where he has bought 19 tickets and a total of 250 tickets have been sold. To find this probability, one must first identify the total possible outcomes, which is the number of tickets sold. Then, determine the number of unsuccessful outcomes for Chris, which would be the number of tickets he did not purchase. Subtracting the number of tickets Chris bought from the total gives us the number of ways he can lose.
Subtract the number of tickets Chris bought (19) from the total number of tickets (250) to find the number of losing tickets, which is 231. So the probability that Chris does not win is the ratio of losing tickets to the total number of tickets:
Probability that Chris does not win = Number of losing tickets / Total number of tickets
= 231 / 250
= 0.924