2002
Mathematics
67ca00ce0c643c71d77dee1f
The venn diagram shows the number of students offering Music and History in a class of 80 students. If a student is picked at random from the class, what is the probability that he offers Music only?
A.
0.25
B.
0.38
C.
0.50
D.
0.13
Correct Answer: 0.25
Explanation
80 = (30 - x) + x + 40 - x + 20 80 = 90 - x, x = 90 - 80 = 10 N (music only) = 30 - x = 30 - 10 = 20 P (music only) = 20/80 = 1/4 = 0.25
80 = (30 - x) + x + 40 - x + 20 80 = 90 - x, x = 90 - 80 = 10 N (music only) = 30 - x = 30 - 10 = 20 P (music only) = 20/80 = 1/4 = 0.25THIS WEEK's
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