... 20 succeeded in both. A student is chosen randomly. Find the probability that this student; a) Succeeded in math b) Succeeded in science c) Failed in science d) Failed in both mats and science
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Google - 4) A class contains 40 students 30 of them succeeded in math. 24 succeeded in science and?
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I want to know how to answer number D
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Answers (1)
There are 40 people.
30 succeeded in math, therefore 10 failed in math (40-30)
24 people succeeded in science, therefore 16 failed in science (40-24)
The probability of failing in math is 10/40
The probability of failing in science is 16/40
10/40 + 16/40 = 26/40 = the probability of a student failing in maths and science