Question

29. The marks obtained by a student in different subjects in the exam are given below
SUBJECT English Hindi Math Physics

MARKS
70 85
97 59
100 75
Find the probability that in an exame will score:
100
80 or more
less than 60​

Answer 1

Step-by-step explanation:

Marks(S)={70,85,97,59,100,75}

         N(S)=6

(i)100

let A be the event of getting 100 marks

A={100}

n(A)=1

P(A)=n(A)/n(S)

the probability that in an examiner will score 100 is 1/6

(ii)80 or more

let B be the event of getting 80 or more

B={85,97,100}

n(B)=3

p(B)=n(B)/n(S)

      =3/6

  the probability that in an examiner will score 80 or more is 1/2

(iii)less than 60

let C be the event of getting less than 60

C={59}

n(C)=1

p(C)=n(C)/n(S)

  the probability that in an examiner will score less than 60 is 1/6