Question

The mean of 9 observations in a data set is 20. What will the new mean if another observation
30 is added to this data set?​

Answer 1

Step-by-step explanation:

if 30 is added the total observation will be 10

so the new mean will be 20+30/10 = 50/10= 5

Answer 2

Answer:21Step-by-step explanation:sum = mean*no .of observations=9*20=180180+30=210mean = 210/1021