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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 1st – 7th 306 248 February 8th – 14th 288 246 February 15th – 21st 274 246 February 22nd – 28th 172 236

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 1st – 7th 306 248 February 8th – 14th 288 246 February 15th – 21st 274 246 February 22nd – 28th 172 236 Correct Answer 16

Formula used:

Average = Sum of all observations ÷ Total no of observations

Calculation:

Average of AQI in Kolkata = (306 + 288 + 274 + 172) ÷ 4 = 1040 ÷ 4 = 260

Average of AQI in Delhi = (248 + 246 + 246 + 236) ÷ 4 = 976 ÷ 4 = 244

∴ The required difference in averages = 260 - 244 = 16

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