The original price of a Kindle is $269.99. If a discount of 15% is given, what is the amount of the discount?
1 answer:
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Answer:
There is a 52% probability that she will get it right.
Step-by-step explanation:
We have these following probabilities:
A 40% probability that the student knows the answer to a question.
A 60% probability that the student does not know the answer to a question.
If the student does not know the answer to a question, a 20% probability of getting the question right guessing.
If we choose a question at random from the exam, what is the probability that she will get it right?
40% probability that she knows the answer
60% that she has to guess, when there is a 20% probability of getting it right. So
There is a 52% probability that she will get it right.