Question

mean of 10 observations is 30 if two more observations are added 7 ,12 included what is the new mean
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Answer 1

PLEASE MARK IT AS BRAINLIEST

Old mean = 30

sum of 10 observations/10 = 30

sum= 300

new mean of 12 terms = sum of 10 observations + 7 + 12 /12

= 300+19 / 12

= 319 / 12

=26.58