Answer:
Her probability to win the prize quilt is 0.06, or she has a 6% probability of winning it.
Step-by-step explanation:
In statistics, <u>a probability of 100% is represented with a 1</u>. In this case, <em>if Sarah would have bought the 250 tickets, she would have a probability of 1 to win the prize</em>, as

then, <em>if this expression is multiplied by 100, we could say that the precentage of probability would have been 100%</em>...
But <u>Sarah didn't buy the 250 tickets</u>, instead she bought 15, therefore

which means that the probability of her winning the prize quilt is 0.06, or, <em>if multiplied by 100, she has a 6% probability of winning the prize quilt</em>.