Q. 674.7( 3 Votes )

The mean of three numbers is 10. The mean of other four numbers is 12. Find the mean of all the numbers.

Answer :

Mean of 3 numbers is 10


Sum of 3 numbers = Mean×3


Sum of 3 numbers = 30


Mean of other 4 numbers is 12


Sum of other 4 numbers = Mean×4


Sum of other 4 numbers = 48


Sum of all 7 numbers = 30 + 48 = 78


Mean of all 7 numbers =


= = 11.14


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