A Jar has 9 white marbles and 6 black marbles. What is the probability of selecting a black marble?
The probability of selecting a black marble is:
6 black marbles / (9 white marbles + 6 black marbles) = 6/15 = 2/5 = 0.4 or 40%
To determine the probability of selecting a black marble, you need to know the total number of marbles in the jar.
In this case, there are 9 white marbles and 6 black marbles, giving a total of 15 marbles.
The probability of selecting a black marble can be calculated by dividing the number of black marbles by the total number of marbles.
Probability of selecting a black marble = Number of black marbles / Total number of marbles
So, the probability of selecting a black marble is 6/15, or simplified, 2/5.