Question

In a class of 42 students in Model High School, 3 students use spectacles.
Fill in the following boxes to find the probability of a students selected
at random is wearing sepctacles.
The total number of students in the class is 42.
∴n(S) =   ...... ,
Let the event, a student uses spectacles, be A.
∴ n(A) = ...........
∴ P(A) =   ............ ∴ P(A) = ............ 

Answer 1

∴ n(S) = 42
∴ n(A) = 3
∴ P(A) = `( n(A))/(n(S))`
∴ P(A) = `1/14`