The Human Resource department of Lala firm has summarized the number of service years of their 120 employees as below. Number of employees 16 Service years 1-4 20 28 5-8 9-12 13-16 24 17-20 16 21-24 11 25-28 a) Calculate the mean and variance for the service years. b) Draw an ogive to represent the data above. Hence, estimate the median value for the above distribution.

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12)
The Human Resource department of Lala firm has summarized the number of
service years of their 120 employees as below.
Number of
Service years
employees
16
1-4
5-8
20
9-12
28
13-16
24
17-20
16
21-24
11
25-28
a) Calculate the mean and variance for the service years.
b) Draw an ogive to represent the data above. Hence, estimate the median value for
the above distribution.
Transcribed Image Text:12) The Human Resource department of Lala firm has summarized the number of service years of their 120 employees as below. Number of Service years employees 16 1-4 5-8 20 9-12 28 13-16 24 17-20 16 21-24 11 25-28 a) Calculate the mean and variance for the service years. b) Draw an ogive to represent the data above. Hence, estimate the median value for the above distribution.
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