Question

a box contains 80 discs which are numbered from 1 to 80. If one disc is drawn at random from the box find the probability that it bears a two digit number, a perfect square number, a number divisible by 5

Answer 1

i) P(2 digit no.) =71/80

ii) P(perfect square)= 8/80=1/10

iii)P(divisible by 5)=16/80=1/5

Answer 2

Answer:

Total number of discs in the box =80

Perfect squares from 1 to 80=1,4,9,16,25,36,49 and 64.

Possible outcomes =8

Probability is given by,

P(A)= No. of total outcomes/no. of possible outcomes

P ( getting a number which is a perfect square )= 8/80= 1/10