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The Alvin Secretarial Service procures temporary office personnel for major corporations. They have found that 90% of their invoices are paid within 10 working days.

The Alvin Secretarial Service procures temporary office personnel for major corporations. They have found that 90% of their invoices are paid within 10 working days. If a random sample of 12 invoices is selected:

a.) What is the probability that all of the invoices will be paid within 10 working days?

b.) What is the probability that fewer than 3 of the invoices will be paid within 10 working days?

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