# Math Help - Estimating the number of 'defectives' in a sample.

1. ## Estimating the number of 'defectives' in a sample.

A container holds 20 bars of chocolate with raisins and nuts.A bar of chocolate is picked at random from the container.The probability of picking a bar chocolate with raisins is $\frac{3}{5}$.How many bars of chocolate with nuts are there in the container..?

2. Originally Posted by mastermin346
A container holds 20 bars of chocolate with raisins and nuts.A bar of chocolate is picked at random from the container.The probability of picking a bar chocolate with raisins is $\frac{3}{5}$.How many bars of chocolate with nuts are there in the container..?
Pr(picking a bar of chocolate with raisins) = x/20 where x is the number of bars of chocolate with raisins. Therefore x/20 = 3/5 => ....