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1.mean of 15 observations is 15.if 25 is subracted from the sum of observation .find the new sum of observations

2..please see the pic and answer


Mean =sum of all observations/no.of observations........ Let the sum of observations be x...... 15=x/15..... x=15*15....... x=225....... 225-25= new sum..... So,new sum =200....... (II) mean = summation of (x1+x2+xn)/n (Sorry but not able to give summation symbol)
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