Question

16. (4) Sum of 22 observation ( =22 times 10 )
( =220 )
Let the sum of two observation ( =x )
( therefore )
( frac{220+x}{22+2}=11 )
( Rightarrow quad 220+x=264 )
( begin{aligned} Rightarrow & & x &=264-220 therefore & & & x=44 end{aligned} )
( therefore ) Average of two new observations ( =frac{44}{2}=22 )

# 16. The mean of 22 observations is Two more observations are included and the new mean becomes 11. The mean of two new observations is RRB NTPC (Phase I) 2016 (1) 19 (3) 21 (4) 22 (2) 20

Solution