Question

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`

Answer 1

There are a total of 30 students in the class.

∴ n(S) = \[\boxed{30}\]

Event A: selected student wears glasses (spectacles).

∴ n(A) = \[\boxed{3}\]

P(A) = \[\frac{\boxed{\text{n(A)}}}{\text{n(S)}}\]   ...[Formula]

P(A) = `3/30` = \[\boxed{\frac{1}{10}}\]