Mean number of correct answers
A multiple choice quiz consists of six questions, each with four possible answers. If the student guesses at the answer to each and every question, then the mean number of correct answers is
A. 6.00
B. 1.50
C. 4.00
D. 10.00
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A furniture manufacturer offers bookcases in three different sizes and three different colors. If every color is available in every size, then the total number of different bookcases is
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In the survey, 55% of the voters support a specific referendum. If 40 voters are selected at random, and X is the number of voters that support this referendum, determine the mean and variance of X.
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i) Draw and verbally explain all symmetries of X. ii) How many symmetries are present? iii) For each of above symmetries, associate to it a 3 x 3 transformation matrix.
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