Answer:
-1/2
Step-by-step explanation:
Rise(-1) / Run(2)
<h2>
Answer:</h2><h2>The probability of selecting a defective roll followed by another defective roll =

</h2>
Step-by-step explanation:
The total number of rolls in a box = 15
The number of defective items = 3
Two rolls are to be selected, one after the other. The probability of selecting a defective roll followed by another defective roll = ?
The probability that the first roll is detective = 
The probability that the second roll is detective = 
Required probability = 
= 
Answer:
3:20
Step-by-step explanation:
4:25-15= 4:10
4:10-20=3:50
3:50-30=3:20
School ended at 3:20