In a class of 42 students. 3 students use spectacles. Complete the following activity to find probability of a student, selected at random, wearing spectacles.

In a class of 42 students in Model High School, 3 students use spectacles. Fill in the boxes to find the probability of a student selected at random is wearing spectacles. rArr The total number of studentd in the class is 42. thereforen(S)=square Let A be the event that a student uses spectacles. thereforen(A)=square P(A)=square" "thereforeP(A)=square

In a class of 125 students 70 passed in Mathematics,55 in statistics,and 30 in both. Then find the probability that a student selected at random from the class has passes in only one subject.

If there are 50 students in a class out of which 35 are boys.if only 60% of students passes in an exmination then find the probability that a student selected at random will be a girl who has passed the exam.

In a Std. X class, out of 40 students, 10 students use spectacles, 2 students have positive power and 8 students have negative power and 8 students have negative power of lenses in their spectacles . Generally which type of spectacles do most of the students use ?

In a Std. X class, out of 40 students, 10 students use spectacles, 2 students have positive power and 8 students have negative power and 8 students have negative power of lenses in their spectacles . What defect of eyesight do must of the students suffer from ?

In a class of 50 students, 20 are boys and rest are girls. A student is selected at random. Find the probability of selecting a boy.

In a Std. X class, out of 40 students, 10 students use spectacles, 2 students have positive power and 8 students have negative power and 8 students have negative power of lenses in their spectacles . What does the negative power indicate ?

In a Std. X class, out of 40 students, 10 students use spectacles, 2 students have positive power and 8 students have negative power and 8 students have negative power of lenses in their spectacles . Give two possible reasons for the above defect .

In a Std. X class, out of 40 students, 10 students use spectacles, 2 students have positive power and 8 students have negative power and 8 students have negative power of lenses in their spectacles . What does the positive power indicate ?