The mean of 25 observation is 80 and the mean of another 55 obserbation is 60. Determine the mean of whole observation?
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ax + by /x + y
where a and b are mean ....and x,y are number of observation.
25*80 + 55*60/25+55
66.25
ax + by /x + y
where a and b are mean ....and x,y are number of observation.
25*80 + 55*60/25+55
66.25
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