Another probability (1 Viewer)

[Michaelmoo]

A factory makes televisions and video machines. By checking for faults regularly, it is found that on average, 5 out of every 300 televisions are faulty and 8 out of every 200 video machines are faulty.

How many televisions must be checked so that the probability of at least one being faulty is greater than 0.95?

What I did was do 1-(probability of not faulty) > 0.95, from this:

(59/60)^n < 0.05

Anyone have a more simple method?

 

[Timothy.Siu]

A factory makes televisions and video machines. By checking for faults regularly, it is found that on average, 5 out of every 300 televisions are faulty and 8 out of every 200 video machines are faulty.

How many televisions must be checked so that the probability of at least one being faulty is greater than 0.95?

What I did was do 1-(probability of not faulty > 0.95, from this:

(59/60)^n < 0.05

Anyone have a more simple method?

that is the simple method.
then u change it to logs, and ur done

 

[Michaelmoo]

that is the simple method.
then u change it to logs, and ur done

O ok. Just thought there might be another way.

Thanks.