Q2// On a certain day an executive received fifteen telephone calls. The distribution of the time spent on a call (in minutes) is given in the first two columns of the table below. Complete the table and find the variance of time spent.

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Q2// On a certain day an executive received fifteen telephone calls. The distribution of the time spent
on a call (in minutes) is given in the first two columns of the table below. Complete the table
and find the variance of time spent.
Time x
2
3
4
6
8
sum
Frequency f
6
4
2
2
1
15
Product fx
12
12
8
12
8
52
x-x
-1.4
-0.4
0.6
4.6
(x − x)²
1.96
0.16
6.76
Transcribed Image Text:Q2// On a certain day an executive received fifteen telephone calls. The distribution of the time spent on a call (in minutes) is given in the first two columns of the table below. Complete the table and find the variance of time spent. Time x 2 3 4 6 8 sum Frequency f 6 4 2 2 1 15 Product fx 12 12 8 12 8 52 x-x -1.4 -0.4 0.6 4.6 (x − x)² 1.96 0.16 6.76
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