Question

McDonald’s dinner service times refers to the accompanying frequency distribution. What problem would be created by using classes of 60-120, 120-180, . . ., 300-360?

Short answer

While using the classes 60-120, 120-180, …. 300-360, there is repetition of service time in class intervals. The upper limit of each class is also included in the next class.

Step-by-step solution

Given information

Refer to frequency distribution of McDonald’s dinner service times.

Service time intervals	Frequency
60-119	7
120-179	22
180-239	14
240-299	2
300-359	5

The given class intervals are 60-119, 120-179, ... ,300-359.

The created class intervals are 60-120,120-180,…,300-360.

Define frequency distribution

A frequency distribution is a tabular summarization of counts of subjects in different categories, formed by using the sample data.

Frequency hence represents the count of data.

Identify the problem in the created class interval

In case of the given frequency distribution, the classes are non-overlapping which means none of the values lie in two different classes.

On the other hand, the class intervals 60-120,120-180, … ,300-360 do not have unique values, and thus determining the frequency under each interval is not possible. For example, 120 belongs to two classes; 60-120 and 120-180. And, this applies for each subsequent classes.