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Counting and Basic Probability · Question 35 of 65

Question 35

EasyOriginal question

The probability that a student picked at random from a college wears spectacles is 0.28. What is the probability that a student picked at random does not wear spectacles?

Options for question 35

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. 'Wears spectacles' and 'does not' are complementary: their probabilities add to 1.

  2. Probability =1−0.28=0.72= 1 - 0.28 = 0.72.

Worth noting

0.28 is the chance of wearing spectacles, the event itself. 0.62 and 0.82 are subtraction slips; check by adding back: 0.72+0.28=10.72 + 0.28 = 1.

Concept
Complement rule
Typical time
40 s
Your time
—
The rule this testsBasic probability
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