Answer Posted / paul

data b;
set a end=lastobs;
age_temp+age;
count+1;
if lastobs then
mean=age_temp/count;
if _n_=13 then
Median=Age; /*median is the mid value */
run;
proc sort data=b out=c;
by age;
run;
data d;
set c;
if first.age=0 and last.age=0 then
Mode=age;/*mode is the most repeated value*/
by age;
run;

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