A lot consists of 144 ball pens , of which 20 are defective and the other are good as told by the shopkeeper. Nuri will buy a pen if it good , but will not buy if it defective . The shopkeeper drws one pen at random and gives it to her . What is probability that (a) she will buy it (b) she will not buy it .
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Answer:
(a) Probability that she will buy = 124/144
(b) Probability that she won't buy = 20/144
Step-by-step explanation:
(a) number of favorable outcome ÷ total number of outcomes
If 20 pens are defective out of 144 pens, then there would be 144 - 20 = 124 good pens.
Therefore, The probability of taking a good pen would be 124 / 144
(b) number of favorable outcomes ÷ total number of outcomes
It is given in the question that 20 pens are defective.
Therefore, The probability of taking a defective pen would be 20 / 144
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