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In Adarsh High School, out of 30 students in a class 3 students wear glasses (spectacles). If a student in the class is randomly selected, find the probability that he or she wears glasses (spectacle - Algebra

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Sum

In Adarsh High School, out of 30 students in a class 3 students wear glasses (spectacles). If a student in the class is randomly selected, find the probability that he or she wears glasses (spectacles) by completing the following activity

Activity: There are a total of 30 students in the class.

∴ n(S) = `square`

Event: A selected student wears glasses (spectacles).

∴ n(A) = `square`

P(A) = `square/("n"("S"))`     ......[Formula]

P(A) = `square`

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Solution

There are a total of 30 students in the class.

∴ n(S) = 30

Event A: selected student wears glasses (spectacles).

∴ n(A) = 3

P(A) = `("n"("A"))/("n"("S"))`     ......[Formula]

P(A) = `3/30` = `1/10`

Concept: Probability of an Event
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