Question : The following bar graph shows the sales of books (in thousands) from six branches of a publishing company during two consecutive years 2018 and 2019.
What is the average sales of all the branches (in thousands) for the year 2018?
Option 1: 84
Option 2: 78
Option 3: 80
Option 4: 86
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Correct Answer: 80
Solution :
Average sales of all the branches (in thousands) for the year 2018
= $\frac{80+75+95+85+75+70}{6}$
= $\frac{480}{6}$
= 80
Hence, the correct answer is 80.
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