Question

McDonald’s dinner service times refer to the accompanying table summarizing service times (seconds) of McDonald’s dinners. How many individuals are included in the summary? Is it possible to identify the exact values of all of the original service times?

Table for Exercise 1

McDonald’s Dinner Service Times

Times (sec)	Frequency
60-119	7
120-179	22
180-239	14
240-299	2
300-359	5

Short answer

In a McDonald’s dinner service time, 50 individuals are included in the summary.

The given data is grouped. Thus, it is not possible to identify the exact values of all the original service times.

Step-by-step solution

Given information

The given data represents that the service time is in seconds of McDonald’s dinners. The table gives us the number of individuals served in the given interval of time.

Define frequency 

The frequency for any class in the table is the number of observations that fall into that class.

In the table, the second column represents the counts of diners who lie in different categories of time.

Let the frequency for the i-th class be represented by f_i

Calculate the surveyed individuals

The total number of individuals included in the summary will be equal to the sum of the frequencies.

So, the total number of individuals included in the summary is

$$\begin{gathered} \sum _i{f}_i=7+22+14+2+5 \\ =50 \end{gathered}$$

Therefore, the total number of individuals is 50.

Conclusion 

The exact values of all times cannot be identified as McDonald’s dinner service times are summarized for 50 diners in the form of categories. The service times are grouped in the form of classes.