I need a step by step break down on this question please show the steps on how to do it not the mean step by step break down . The last question I ask just showed the answer but not the break down on...

I need a step by step break down on this question please show the steps on how to do it not the mean step by step break down . The last question I ask just showed the answer but not the break down on how you got it.

If the Data set of Mangos are: 1,1,2,3,5,5,6,3,2,2,1,0

#3
E ( x +3) please show break down like previously step by step