RRB Assistant Loco Pilot and Technician Model Paper 6 with solutions

Sum of 25 observations = 25 × 36 = 900
Sum of first 13 observations
= 13 × 32 = 416
Sum of last 13 observations
= 13 × 39 = 507
Thus, the 13th observation
= 416 + 507 – 900
= 923 – 900 = 23