Question

There are 24 beads in a box, some white and black. The probability of drawing a white bead from it is 1/3.
a)how many white beads?
b)how many black beads?
c)how many black beads should be removed to make the probability of drawing a white is 1/2?

Answer 1

let the no. of white beads be x

p(e) = no. of outcomes favourable at E / total no. of possible outcomes

p( getting white beads ) = x/ 24

x/24 = 1/3

x= 24/3

x= 8

No. of white beads is 8

no. of black beads = 24-8= 16

the probability of drawing white 1/2 means it would be 12/24

so 4 more black beads should be removed