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?
-
A.
0.10 -
B.
0.30 -
C.
0.60 -
D.
0.70
Correct Answer: Option B
Explanation
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) = (frac{15}{50} = 0.30)