Question 1190147
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(1) P(5 right)....<br>
{{{(1/3)^5 = 1/243}}}<br>
(2) P(4 right)....<br>
(a) P(each one right) = 1/3; P(each one wrong = 2/3)
(b) P(four right, one wrong, in a particular order) = (1/3)^4 times (2/3)^1 = 2/243
(c) number of different choices for the one problem that is wrong = 5<br>
P(4 right) = 5 * 2/243 = 10/243<br>
P(pass test) = P(4 or 5 right) = 1/243+10/243 = 11/243<br>
ANSWER: 11/243<br>