SOLUTION: The mean of a list of 80 nos. is 230. If the four nos. 145,156,210 and 255 are added, what is the mean of the list of nos. I asked this question yesterday and have been ponderin

Question 629654: The mean of a list of 80 nos. is 230. If the four nos. 145,156,210 and 255 are added, what is the mean of the list of nos.
I asked this question yesterday and have been pondering it since then. I think I have the solution but would you check it for me please.
Sum of 80 nos. is 18,400 80*230
Sum of 4 nos added is 766
Mean of new list is 19166/84=228.17
Thank you
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

Good work!

Sum of 80 nos. is 18,400 80*230

 Sum of 4 nos added is 766

 Mean of new list is 19166/84=228.17 



Re: TY, Yes! You are exactly correct. "Two-tailed" z = 1.75 

Re: 110.25 for number of People...round 'Up' to .

Note:    

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