Hai xạ thủ cùng bắn vào một tấm bia một cách độc lập, mỗi người bắn một phát. Xác suất xạ thủ I, II bắn trúng lần lượt là 70%;
80%. Đặt các biến cố:
A : “Chỉ có một xạ thủ bắn trúng”
B : “Xạ thủ I bắn trúng”
C : “Cả hai xạ thủ bắn trúng”
Tính P(B|A).

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels. ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0