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# A one hour routine check was made by security staff of MNC from $\large \frac{1}{2}$ hour before office opening time. Total 80 cars are checked and result was 9 cars carrierd no official, 20 cars carried one official, 16 cars carried 2 officials, 20 cars carried 3 officials and 15 cars carried 4 officials. (i) Using this information, write down a row matrix and a column whose product gives us the total number of official carried by the 80 cars. (ii) What was the average number of official per car?

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