According to a study, 50 % of adult smokers started smoking before 21 years old. 7 smokers 21 years old or older are randomly selected, and the number of smokers who started smoking before 21 is recorded. 1. The probability that at least 3 of them started smoking before 21 years of age is

2. The probability that at most 5 of them started smoking before 21 years of age is

3. The probability that exactly 2 of them started smoking before 21 years of age is

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your answer is 228

step-by-step explanation:

add the top and bottom bases together, then divide them by 2, then multiply by the height.

all group life insurance is term insurance. actually it is annual renewable term and it is rated on the average age and claims experience of the entire group, which is called "experience rating." remember, this type of insurance has a 31-day grace period and is convertible to whole life upon leaving employment. a contributory group plan requires that both the employer and the employees pay part of the premium. at least 75% of those eligible must participate, so the group is sure to get most of the healthy employees as well as those that are sick.

step-by-step explanation: