A negative option club has noted the number of days between


A negative option club has noted the number of days between billing and payment is normally distributed with a mean of 16 days and a standard deviation of 5 days.

a. What proportion of customers pay in 12 to 20 days after billing?

b. After how many days will 25% of all bills remain unpaid?

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Basic Statistics: A negative option club has noted the number of days between
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