1.

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 TrendAir Quality IndexPeriodKolkataDelhiFebruary 1st – 7th306248February 8th – 14th288246February 15th – 21st274246February 22nd – 28th1722361. 142. 183. 164. 12

Answer» Correct Answer - Option 3 : 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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