Question

an airport measures the check-in waiting time for people on a certain flight. The times ( in minutes) for 14 passengers are given below. Determine the class width for a grouped data frequency table using 4 classes. 13,18,21,21,24,25,26,28,30,30,30,34,35,38

Answer 1

The formula for class width is

$class\text{ width=}\frac{Maximumvalue−Minimumvalue}{n}$

Where,

Minimum value = 13

Maximum value = 38

n = 4

$class\text{ width=}\frac{38-13}{4}=\frac{25}{4}=6.25$

Hence, the class width will be 7 since the next whole number after 6.25 is 7.