St pass a placement exam to get into a needed class

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Reference no: EM13628987

A student must pass a placement exam to get into a needed class. Suppose the student guesses on all the answers and therefore has only 10% chance of passing the test each time.

a) What is the expected number of times the student will need to take the test before passing?

b) What is the probability that the student takes the test only once or twice?

Reference no: EM13628987

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