Question

(18) There are two kinds of
instant messaging
software
and​

Answer 1

Explanation:

Individual Series

Step 1: Assume any one value as a mean which is called arbitrary average (A).

Step 2: Find the difference (deviations) of each value from arbitrary average.

Step 3: Add all differences to get ∑ d.

Step 4: Use following equation and compute the mean value. X ¯ = A + ∑ d n.

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Answer 2

Answer:

Explanation:

The four general types of instant messaging and chat programs are:

Single-protocol and multi-protocol programs.

Mobile clients.

Enterprise Software.

Web-based messengers.