Question

define the following statistical terms:
1. mean
2. mode
3. median

the following have differing roles within a large IT department in the development of a new computer system. define these roles and responsibilities:
1. project manager
2. technical manager
3. database administrator

Answer 1

Mean. Mode,Median are used to find midpoint in a group of numbers in different ways.

1. Mean

Mean is equivalent to average.

Lets say below are the marks of a student in different subjects.

98,85,95,76,95,87

If we want to find mean/average of the students marks. we have to add all the marks obtained and divide it by number of subjects

(98+85+95+76+95+87)/6=536/6=89.33

2.Mode

Mode refers to the number the occured most frequently. There can be more than one mode or not at all depending upon the number list provided.

In above marks 95 appeared twice ,hence 95 is the mode.

3.Median

Median refers to middile value in a data set.

To find median we need to arrange the numbers in assending(increasing) order and pick the middle value.

Eg: for our marks data set

76,85,87,95,95,98

Here we have even number of data elements, hence we have 2 middle values, to find the median we need to find average of these two middle values.

(87+95)/2=182/2=91

For odd number of data elements we will get the median as middle value directly.

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Roles and responsibilities

1. Project Manager

Project Manger manages resources(team members,time,budget..) and client.

PM plans human resources needed, budget allocation,Tracking the deliverables.. ensuring the client satisfaction.

2.Technical Manager

Technical manager is technically we informed and can provide his/her team with technical guidance. Technical manager can assign tasks to the team members and review them. Technical manager responsibility is to complete the deliverables within deadline ensuring the quality.

3.Database Admin

DBA responsibility is to ensure the data is available, secure, and easily accessible as needed.

DBA can do software installations and maintaince,DB backup and recovery,setting up authentication and security rules to safeguard the data.