If the arithmetic mean of the following series is 115.86, find the missing value. {:("Wages(Rs.)",110,112,113,117,?,125,128,130),("Number of Workers",25,17,13,15,14,8,6,2):}

If the arithmetic mean of the following series is 115.86, find the mis

1.	If the arithmetic mean of the following series is 115.86, find the missing value. {:("Wages(Rs.)",110,112,113,117,?,125,128,130),("Number of Workers",25,17,13,15,14,8,6,2):}
Answer» Solution :LET the MISSING VALUE be X. `barX=(sumfX)/(sumf)` `115.86=(9,906+14X)/100` `115.86xx100=9,906 +14X` `14X=11,586-9,906` `14X=1,680` `X=(1,680)/14=120` Missing Value = 120.