Phát hành 100000 vé số thì có 10000 vé trúng thưởng. Hỏi một người muốn trúng ít nhất 1 vé với xác suất lớn hơn 95% thì cần mua tối thiểu bao nhiêu vé? ĐS: 29 vé

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Abag of jelly beans contain 13 pink, green, 20 yellow, 10 black, 7 red, and 11 orange jelly beans. approximately what percent of the jelly beans are pink and yellow?

If rs 900 amounts to rs 1044 in 4 years, what sum will amount to 1368 in 3 1/2 years at the same rate