The following table shows the Air Quality Index (AQT) (PM2.5) for the four weeks of February 2018. What is the difference in the average of AQI in Kolkata and Delhi in the month of February? Toxic Trend Air Quality Index; Period, Kolkata, Delhi; February 1^st – 7^th, 306, 248; February 8^th – 14^th, 288, 246; February 15^th – 21^st, 274, 246; February 22^nd – 28^th, 172, 236

Railways PYQCBT 1 2020

RRB NTPC · Question 57

The following table shows the Air Quality Index (AQT) (PM2.5) for the four weeks of February 2018. What is the difference in the average of AQI in Kolkata and Delhi in the month of February?

Toxic Trend Air Quality Index
Period	Kolkata	Delhi
February 1^st – 7^th	306	248
February 8^th – 14^th	288	246
February 15^th – 21^st	274	246
February 22^nd – 28^th	172	236

Show answer & explanation

Answer: (C) 16

Explanation

Kolkata's average = (306 + 288 + 274 + 172)/4 = 260. Delhi's = (248 + 246 + 246 + 236)/4 = 244. Difference = 16.