The mean of a set of numbers is 20. If each number is multiplied by 2, then find the mean of the new set

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Given that mean of a set of numbers is 20. Each number is multiplied by 2.
The value of the mean of a given data set is the average of a given set of numbers.
Suppose the set of numbers be

x 1, x 2, x 3 … … .. x n

Thus, the mean of set is,

x ¯ = x 1 + x 2 + x 3 … … . x n n

Now, if each number is multiplied by k, then new numbers will be

k x 1, k x 2, k x 3 … … . k x n

The mean of new set is,

⇒ X ¯ = k x 1 + k x 2 + k x 3 … … k x n n ⇒ X ¯ = k x ¯

Substituting the values, we get,

X ¯ = 2 × 20 ⇒ X ¯ = 40

So, the new mean is 40.
Therefore, option (1) is correct.

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

How to Join IIT after 10th

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Get Expert Academic Guidance – Connect with a Counselor Today!

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

How to Join IIT after 10th