Question

The mean of 11 numbers is 35.If the mean of first 6number is 32 and that of last 6 numbers is 37, then find the 6th number.

Answer 1

11 numbers average =35 first 6 numbers average =32 last 6 numbers average =37 =11 ×35=385 =32×6=192 =37×6=222 = ( 192+222) - 385 =29

Answer 2

Sum of all 11 numbers = 11*35 = 385
Sum of first 6 numbers = 6*32 = 192
Sum of last six numbers = 6*37 = 222

Sum of first six and last six numbers = 192+222 = 414

Sixth number = 414 - 385 = 29