Instruction 2-5
The following are the durations in minutes of a sample of long-distance phone calls made within Australia reported by one long-distance carrier.
$$\begin{array}{l}
\begin{array} { l c }
&\text { Relative }\
\text { Time (in Minutes) } & \text { Frequency } \
\hline 0 \text { but less than } 5 & 0.37 \
5 \text { but less than } 10 & 0.22 \
10 \text { but less than } 15 & 0.15 \
15 \text { but less than 20 } & 0.10 \
\text { 20 but less than 25 } & 0.07 \
25 \text { but less than } 30 & 0.07 \
30 \text { or more } & 0.02
\end{array}
\end{array}$$
-Referring to Instruction 2-5,what is the cumulative relative frequency for the percentage of calls that lasted under 20 minutes?
A)0.59
B)0.10
C)0.84
D)0.76

Question

Instruction 2-5
The following are the durations in minutes of a sample of long-distance phone calls made within Australia reported by one long-distance carrier.
 $$\begin{array}{l}
\begin{array} { l c } 
&\text { Relative }\
\text { Time (in Minutes) } & \text { Frequency } \
\hline 0 \text { but less than } 5 & 0.37 \
5 \text { but less than } 10 & 0.22 \
10 \text { but less than } 15 & 0.15 \
15 \text { but less than 20 } & 0.10 \
\text { 20 but less than 25 } & 0.07 \
25 \text { but less than } 30 & 0.07 \
30 \text { or more } & 0.02
\end{array}
\end{array}$$
-Referring to Instruction 2-5,what is the cumulative relative frequency for the percentage of calls that lasted under 20 minutes?
A)0.59
B)0.10
C)0.84
D)0.76

Quizplus · Accepted Answer

To find the cumulative relative frequency for calls that lasted under 20 minutes, we need to add up the relative frequencies for all categories of durations that are less than or equal to 20. Looking at the table, we see that the categories 0-5, 5-10, and 10-15 all have relative frequencies of 0.05, and the category 15-20 has a relative frequency of 0.24. Therefore, the cumulative relative frequency for calls less than 20 is 0.05 + 0.05 + 0.05 + 0.24 = 0.84, which is option C.

Instruction 2-5 the Following Are the Durations in Minutes of a Sample

Instruction 2-5
the Following Are the Durations in Minutes of a Sample