Question 629654
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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 <u>number of People</u>...round 'Up' to {{{111}}}.
Note:  {{{1.75(12/sqrt(110)) > 2}}}