In a class of 50 pupils, 35 like Science and 30 like Hist...
In a class of 50 pupils, 35 like Science and 30 like History. What is the probability of selecting a pupil who likes both Science and History?
0.10
0.30
0.60
0.70
Correct answer is B
Let the number of students that like both Science and History = x
Number of Science only = 35 - x
Number of History only = 30 - x
35 - x + 30 - x + x = 50
65 - x = 50
x = 15
P(Science and History) = 1550=0.30
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