Final answer:
The percent change in the number of students is approximately 26.67%.
Step-by-step explanation:
To find the percent change p in the number of students, we can use the formula for percent change:
Percent Change = ( (New Value - Original Value) / |Original Value| ) * 100%
For the classroom situation:
- Original Value (O) = 15 students
- New Value (N) = 19 students
Substituting these values into the formula gives us:
p = ( (19 - 15) / 15 ) * 100%
Calculating the change gives us:
p = ( 4 / 15 ) * 100%
Thus, the percentage increase (p) would be calculated as follows:
p ≈ 26.67%