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Mean and standard deviation for the number of customers

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Reference no: EM132855916

Be sure to show all your work and/or explain clearly.   

From past records, a department store finds that 70% of the people who enter the store will make a purchase on Black Friday. Suppose that 3 customers are randomly selected, answer the following questions. 

  1. What is the probability that exactly one out of three customers make a purchase?
  2. What is the probability that none of the customers make a purchase?
  3. What is the probability that at least one customer makes a purchase?
  4. Find the mean and standard deviation for the number of customers who make a purchase. Round your answers to one decimal place.  

Reference no: EM132855916

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