Question

A set of 10 values has arithmetic mean 20.find the arithmetic mean if I) Each value is doubled II) Each value is increased by 5 III) Each value is increased by 5 and then doubled iv) Each value is decreased by 5 and then doubled ​

Answer 1

Step-by-step explanation:

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:

mean =10x/10

20*10=10x

200/10=x

20=x

if value doubled

mean=400/10

mean =40

if increased by 5

mean =250/10

mean =25

if decreased by 5 and then doubled

mean =300/10

mean =30

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