average of 20 observation is 36, average decrease by 1 when new observation included. What is the new observation?
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Answer:
Step-by-step explanation:
total of 6 observations = 20×36= 72
0
Total of 21 observations (including the 7th)
= 21×(36-1)=735
Therefore, 21th observation = 735 - 720= 15
Ishwariyamurugan:
thank you lavanya
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