Question

A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be red?
[ 2 Marks ]

Answer 1

Total number of marbles in the box = 5 + 8 + 4 = 17
$\therefore$ Total number of elementary events = 17
[0.5 Marks]

There are 5 red marbles in the box.
$\therefore$ Favourable number of elementary events = 5
[0.5 Marks]

$\therefore$ P(getting a red marble) $=\frac{5}{17}$
[1 Mark]