Math, asked by darkstar7, 1 year ago

Find mean of 30 no.s, given that ten of them have mean 12 and mean of the remaining 20 is 9.

Answers

Answered by Rahul11112222333

1

sum of 10/10=12
sum of 10=120

sum of 20/20=9
sum of 20=180

Total sum=120+180= 300
mean=300/30=10

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