A sample of 100 customers at the Lighthouse Cafe resulted in the following frequency distribution for a dinner bill.
Amount Number
0-4.99 10
5-9.99 15
10-14.99 40
15-19.99 19
20+ 16
1. Let A be the event that the dinner bill is $10 or over. What is the P(A)? (Round to the nearest hundredth)
2. Let B be the event that the dinner bill is less than $15. What is the P(B)? (Round to the nearest hundredth)
3. Wendy is a waitress at the Lighthouse Cafe and wants to find the probability that a table leaves her a $4 tip or larger. Let's assume that everyone leaves a 20% tip. What is the probability that Wendy receives a $4 tip or larger?