It is known that 70% of the customers in a sporting goods store purchase a pair of running shoes. A random sample of 25 customers is selected. Assume that customers' purchases are made independently, and let x represent number of customers who purchase running shoes.
What is the probability that exactly 18 customers purchase running shoes?

What is the probability that no more than 19 customers purchase running shoes?

What is the probability that at least 17 customers purchase running shoes?

What is the probability that between 17 and 21 customers, inclusively, purchase running shoes?

Question

It is known that 70% of the customers in a sporting goods store purchase a pair of running shoes. A random sample of 25 customers is selected. Assume that customers' purchases are made independently, and let x represent number of customers who purchase running shoes.
What is the probability that exactly 18 customers purchase running shoes?
______________
What is the probability that no more than 19 customers purchase running shoes?
______________
What is the probability that at least 17 customers purchase running shoes?
______________
What is the probability that between 17 and 21 customers, inclusively, purchase running shoes?
______________

Rahul Radhesh · Accepted Answer

Final Answer : 0.171; 0.807; 0.677; 0.644

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