Answer:
The no. of students that play at least one instrument = 448
Step-by-step explanation:
Total number of students surveyed = 480
Students play piano = Â 253
Students play harp  =  268
Students play both harp & Piano = 73
Thus number of student surveyed that they play at least one of the instrument  = (Students play piano) + (Students play harp) - (Students play both devices)
= 253 + 268 - 73
= 448