An archaeological excavation at Burnt Mesa Pueblo showed that about 10% of the flaked stone objects were finished arrow points†. How many flaked stone objects need to be found to be 90% sure that at least one is a finished arrow point? (Hint: Use a calculator and note thatP(r= 1)= 0.90 is equivalent to 1-P(0)= 0.90, orP(0)=0.10.)