The following table gives the sales of an electronic chip over 5 years. Find the year in which the sales are equal to the average of the sales over the 5 years. Year 2015 2016 2017 2018 2019 Sale (in thousands of rupees) 45 54 57 60 69

2018 2015 2017 2016

2017

Average of sales = \(\frac{45+54+57+60+69 }{5}\) = \(\frac{ 285 }{5}\) = 57 Sale in year 2017 is 57 which is equals to average sales over all years. Ans :- 2017