# Thread: What is the probability of...

1. ## What is the probability of...

Here is the data to answer the question below:

Short Sleeve:163 that are blue and 295 that are not blue
Non Short Sleeve: 49 that are blue and 123 that are not blue

If 1 student is randomly selected, find the probability of getting someone who did not wear blue or wore a non-shot-sleeve shirt.

Is it [418+172]/630 = 0.9365 or is it [418+49]/630 = 0.7413.

SOS

2. Originally Posted by DINOCALC09
Here is the data to answer the question below:

Short Sleeve:163 that are blue and 295 that are not blue
Non Short Sleeve: 49 that are blue and 123 that are not blue

If 1 student is randomly selected, find the probability of getting someone who did not wear blue or wore a non-shot-sleeve shirt.

Is it [418+172]/630 = 0.9365 or is it [418+49]/630 = 0.7413.

$\displaystyle \frac{295 + 123 + 49}{630}$ is the answer. You are double counting not blue and not short sleeve ....