Chapter- Probablity,Statistics Ques:1) Mean of 12 observation is 17. If each observation is decreased by 2. Find the new mean.(Mark-1) Solution: For mean (x̅),   x̅ = (Sum of all obs.)/(Total no. of obs.) 17  = (Sum of all obs.)/12 Sum of all obs. = 17 × 12               … Continue reading CL9:Maths Probablity,Stats_Solved important Questions