A larg e store has a customer service department where customers can go to ask f

Question

A larg e store has a customer service department where customers can go to ask for help with store-related issues. According to store records, approximately of all customers who go to the service department ask for help finding an item. Assume the reason each customer goes to the service department is independent from customer to customer. Based on the approximation, what is the probability that at least 1 of the next 4 customers who go to the service department will ask for help finding an item? (A) 4 (B) 1-(1 (D) 4/11/3

Explanation / Answer

here probability that an individual ask for help =1/4

hence probability that individual does not ask for help p =1-1/4 =3/4

therfore probability that at least one of next 4 ask for help =1-P(none of them ask for help)

=1-(3/4)4

therefore option C is correct

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