The mean of 10 numbers is 20. If 5 is subtracted from  every number, what will be the new mean?

Explanation

Mean`=20`
Total numbers`=10`
Mean`=20`
Total numbers`=10`
Total sum`=200`
If `5` is decreased from all numbers
mean subtracting `(10xx5)` from `200` make
Total `sum=200−50=150`
New Mean `= 150/10=15`
Hence New Mean is `=15`