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A cell phone retailer offers insurance plans to it's customers that provide protection if their phone...

A cell phone retailer offers insurance plans to it's customers that provide protection if their phone is lost or actually damage. Sara is a sales representative for Verizon and has sold the insurance plan to 90% of her customers. if Sarah has sold cell phones to 25 customers this week, answer the following questions using the binomial tables
a) What is the mean number of insurance plans?
b) What is the variance and standard deviation?
c) What is the probability that exactly 20 customers purchase the insurance plan?
d) What is the probability that 20 or more customers will purchase the insurance?
e) What is the probability that 24 or fewer will purchase the insurance plan?
Math   Statistics-And-Probability   
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