In a batch of 890 calculators, 12 were found to be defective. What is the probability that a calculator chosen at random will be defective?

1 Answer
Athleticbrainiac
Sep 17, 2016

The probability of choosing a defective calculator at random would be #12/890# (or #~~1.35%#).

Explanation:

The reason why the probability of choosing a defective calculator is #12/890# is because as stated in the problem, #12# calculators would be defective out of #890#, thus the ratio would be #12# to #890#.

Note: Some people might want to simplify the fraction, however if you simplify #12/890# into #6/445# then you not would be telling the whole story.

Finally, to get #1.35%# you can write the following proportion.

#12/890=x/100#

Multiply #12# by #100# and #890# by #x#. After that you should get the following:

#890x=1200# Divide by #890#

#x=1.3483146057413033707...#

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