Question

3. Arithmetic mean of a given series is 20. If a number 3 is multiplied with each number of the series, new arithmetic mean will be ... (a) 20 (b) 40 (c) 60 (d) Can't be determined​

Answer 1

Answer:

Explanation:Correct option is  D

45

Mean of 10 number is 20.

Sum of 10 numbers = 200

When each number is multiplied by 2 and 5 is added to each number, new sum = 2×200+10×5=450

Now, new mean =  

10

450

​

=45

Answer 2

Answer:

option D

Explanation:

will be the write answer