Question : The following table shows the number of trucks of 6 different brands sold from a showroom during a given period of time.
| Brand | Trucks |
| B1 | 45 |
| B2 | 35 |
| B3 | 36 |
| B4 | 44 |
| B5 | 28 |
| B6 | 22 |
There are 8 tyres on each truck, irrespective of the brand of the truck. What is the average number of tyres per brand?
Option 1: 280
Option 2: 300
Option 3: 260
Option 4: 240
Correct Answer: 280
Solution :
Average = $\frac{\text{Sum of Observations}}{\text{Number of Observations}}$
Average = $\frac{8 \times {(45+35+36+44+28+22)}}{6}$ = 280
$\therefore$ The average number of tyres per brand is 280.
Hence, the correct answer is 280.
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