Question

refer to the table summarizing service times (seconds) of dinners at a fast - food restaurant. how many individuals are included in the summary? is it possible to identify the exact values of all of the original service times?
time (sec) frequency
60 - 119 7
120 - 179 22
180 - 239 12
240 - 299 3
300 - 359 5

individuals are included in the summary (type a whole number.)
is it possible to identify the exact values of all of the original service times?
a. no. the frequency distribution tells nothing about the data values that fall below the lowest class limit or above the highest class limit.
b. no. the data values in each class could take on any value between the class limits, inclusive.
c. yes. the data values in each class are equal to the corresponding class midpoint.
d. yes. the data values in each class are spread evenly across the full length of the class.

Explanation:

Step1: Calculate total number of individuals

The total number of individuals is the sum of the frequencies. So we add 7 + 22+12 + 3+5.
$7+22 + 12+3+5=49$

Step2: Analyze if original values can be identified

In a frequency - distribution table, the data values in each class could take on any value between the class limits, inclusive. So it is not possible to identify the exact values of all of the original service times.

Answer:

49
B. No. The data values in each class could take on any value between the class limits, inclusive.