Question

there are 11 cojecutive observatios..if the avg of first 7 is 17 then what is the sum of least and highest no.???

Answer 1

take first value as x.
so
(x+x+1+x+2+x+3+x+4+x+5+x+6)/7=17
x=14

then d least number x=14
and d highest x+10=14+10=28
and there sum=38