The mean of five numbers is 30. If one number is excluded, their...

Mean of 5 numbers = 30 $\therefore \quad$ Total sum of 5 numbers $=30 \times 5=150$ After excluded one number Mean of 4 numbers will be $=28\therefore \quad$ Total sum of 4 numbers $=4 \times 28=112$ Thus, excluded number $=($ sum of 5 numbers - sum of 4 numbers $)=150-112=38\therefore \quad$ Option (D) is correct.