Question

mean of 15 numbers is 10 if 3 is added in 1 to 10 number then new mean is 12.prove it

Answer 1

Answer:

7

Step-by-step explanation:

the mean of 15 numbers is 5

therefore their sum=15*5=75

if 2 is added to each number then 2 is added to the all the 15 numbers

therefore 2*15 or 30 more will be added to the sum or 75

=75+30=105

therefore new mean = 105/15=7 [mean=sum of observations/no. of observations

Answer 2

Answer:

Please recheck your question. Your question is wrongly typed here. It is impossible.

I think, you have not used commas and fullstops at proper places, which is making confusions to me.

Instead of 'added' word, you should have typed the word 'substracted'.