There are 12 AAA batteries in a box and 2 are defective. Two batteries are selected...
There are 12 AAA batteries in a box and 2 are defective. Two batteries are selected without replacement. What is the probability of selecting a defective battery followed by another defective battery? Please put your answer in decimal form, with 2 decimal places
Homework Answers
Probability of first event i,e selecting a defected battery.
Sample space is 12 and probability interest is 2
SO probability is 2/12 = 0.167
Now probability of second event
sample space is 11, as one battery is already drawn in event 1.
probability interest is 1 as one defective battery is already drawn out of 2.
SO probability of second event is
1/11 = 0.091
Total probability of selecting a defective battery followed by
another defective battery = 0.167 
0.091 = 0.015
0.02
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