Question

11) Mean of 10observation is 20 and mean of 15 observations is 25, then find mean of all 25 observation.​

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Mean=sum/number

→ sum = mean*number

For 10 obs, sum=20*10=200

For 15 obs, sum=15*25=375

Mean of all=(200+375)/(10+15)=23