SOLUTION: Hand sanitizer kills a certain bacterium 80% of the time on each application. What is the minimum number of times you must use the hand sanitizer to be 98% certain you have killed

Question 762773: Hand sanitizer kills a certain bacterium 80% of the time on each application. What is the minimum number of times you must use the hand sanitizer to be 98% certain you have killed that bacterium?
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!
We'll write:

and 98% implies P=1-0.98 = 0.02

Solving...

so we need to apply 18 times

:)

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