The mean 20 observation is 25. In each observation is multiplied by 2. What is the new mean of  Observation?????/

 The mean of 20 observations is 25. Sum of all the two observations is 20*25 = 500

If each mean is multiplied by 2 then then sum 500 will become 500*2=1000

so

then then mean will be

1000/20=50