سؤال في الأحصاء

[sultan929]

The manager of a bank recorded the amount of time each customer spent waiting in line during
peak business hours one Monday. The frequency table below summarizes the results.
Waiting Time Number of
(minutes) Customers
0-3 14
4-7 9
8-11 11
12-15 6
16-19 7
20-23 3
24-27 2
If we randomly select one of the customers represented in the table, what is the probability that the
waiting time is at least 12 minutes or between 8 and 15 minutes?

احتمال A يساوي 18 على 52
واحتمال B يساوي 17 على 52
والمشترك بينهم 6 على 52

سؤالي كيف أوجت كل من 18 و 17