HELP! Word problem!?

1. The Alvin Secretarial Service procures temporary office personnel for major corporations. They have found that 50% of their invoices are paid within ten working days. A random of 10 invoices is checked. What is the probability of exactly 5 of the invoices will be paid within 10 working days?

This is a Binomial distribution problem with n=10 (number of invoices) p =0.5 (probability that they are paid within 10 working days).
We want P(x=5) where x is the number of invoices paid within 10 working days.
P(x=k)=nCk p^k (1-p)^(n-k)
nCk = n ! / k ! (n-k)!
=10C5 (1/2)^5 (1/2)^5 = 0.2461

50%

Tags

　　Conference Room 　　Offices to Lease 　　Rent Offices 　　Business Centers 　　Service Offices 　　Branch Offices 　　Temporary Offices 　　Shared Offices 　　Commercial Space 　　Office Space 　　Business Services 　　Business Address

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