The mean of 8 numbers is 35. If a number is excluded then the mean is reduced by 3. Find the excluded number.
Mean of 8 numbers = 35
Sum of 8 numbers = 8×35 = 280
New mean = 35-3 = 32
Sum of 7 numbers = 32×7 = 224
Excluded number = sum of 8 numbers – sum of 7 numbers
= 280 – 224 = 56
So, the excluded number is 56.