The average of 12 numbers is 9. if each number is multiplied by 2 and added to 3, the average of the new set of numbers is b) 18 (a) 9 (d) 27 (c) 21

option c 21

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Its 21. The average of 12 numbers is 9. That means the total number is 12 X 9 = 108 if each number is multiplied by 2, the average will also be multiplied by 2. That is the new av...

Correct Option: C If each number of a set be multiplied by m, the average gets multiplied by m. If each number of a set be increased by p, the average gets increased by p. Here , ...

Let the sum of 12 no. be x=x1​+x2​+........x12​ average=total no.sum of no.​ ⇒9=12x​ sum=108 let sum of new numbers is according to question (x1​×2+3)+(x2​×2+3)+......(x12​×2...