Question

the mean of 10 number is 30. If 3 is subtracted from every number, find the new mean
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Answer 1

Answer:

Mean=20

Total numbers=10

Total sum=200

If 5 is decreased from all numbers

 mean subtracting (10×5) from 200 make total sum=200−50=150

New Mean=10150=15

Hence New Mean =15

Answer 2

Step-by-step explanation:

30=x+x+x+x+x+x+x+x+x+x/10

30*10=10x

300/10=x

30=x

if 3is subtracted

mean =27+27+27+27+27+27+27+27+27+27/10

270/10

=27

so new mean =27

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