please give answers as soon as you can for the attached questions
1.Below are the times (in days) it takes for a sample of customers from Andrew's computer store to pay their invoices. 21, 26, 35, 18, 43, 37 Find the standard deviation of this sample of times. Round your answer to at least two decimal places
2. An experiment involves participants. From these, a group of participants is to be tested under a special condition. How many groups of participants can be chosen, assuming that the
order in which the participants are chosen is irrelevant?
3. Suppose that and are independent events such that and .
Find and . Suppose that and are independent events such that and .
Find and . (If necessary, consult a list of formulas.) P ( A ?B ) =
P ( A ?)B = 4.At a local college, Of the female students, of the male students are smokers and are smokers and are non?smokers. are non?smokers. A male student and a female student from the college are randomly selected for a survey. What is the probability that both are non?smokers? Do not round your answer
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