Question

the class mark of a class interval is 10.5and size is 7 find the class interval

Answer 1

10.5 + 7/2 = 10.5 + 3.5 = 14 10.5 - 7/2 = 10.5 - 3.5 = 7 ∴ one class interval is 7-14 Class interval + class size 14+7=21 21+7=28 28+7=35 35+7=42 and so on...... ∴class intervals are 7-14 14-21 21-28 28-35 35-42 etc.....

Answer 2

class interval is 7-14 , 14-21 , 21-28 ............