Question

उ. कोई कारण बताते हुए 3 दिनों की छुट्टी मांगते हुए प्रधानाध्यापिका को एक छुट्टी पत्र लिखिए।
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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.