A Class Is Administered a Test Consisting of Five Four-Alternative

A class is administered a test consisting of five four-alternative multiple-choice items.?
(a)List the ways in which one could obtain a score of four correct on this test.
(b)What is the probability of obtaining a score of exactly four correct by guessing randomly on each item?
(c)What is the probability by guessing randomly of obtaining a perfect score on the test?
(d)What is the probability of obtaining a score of four correct or better on the test by guessing randomly?
(e)What is the probability of missing all five items through random guessing?

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(a)?RRRRW, RRRWR, RR...

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