Study the given line graph and answer the question that follows.

The line graph shows the sales (in units) of motor bikes of five companies, 1, 2, 3, 4 and 5 over the years 2017 and 2018.

Which of the following statements regarding the sales represented in the graph is NOT true?

Correct option is A

Given:

Sales Data (from the graph):

Company 1:

2017: 85 units

2018: 90 units

Company 2:

2017: 90 units

2018: 85 units

Company 3:

2017: 75 units

2018: 80 units

Company 4:

2017: 80 units

2018: 70 units

Company 5:

2017: 70 units

2018: 75 units

Solution:

Let's check each statement one by one:

Statement A: "The total sales of all the companies in 2018 are higher than that in 2017."

Total sales in 2017:
85 + 90 + 75 + 80 + 70 = 400 units

Total sales in 2018:
90 + 85 + 80 + 70 + 75 = 400 units

The total sales in 2018 are lower than in 2017.

So, Statement A is NOT true.

Statement B: "For both the years together, company 5 has the lowest total sales among all companies."

Sales for Company 5:

75 + 70 = 145 units

Sales for Company 1:

85 + 90= 175 units

Sales for Company 2:

90 + 85 = 175 units

Sales for Company 3:

75 + 80 = 155 units

Sales for Company 4:

80 + 70 = 150 units

Company 5 has the lowest total sales with 145 units.

So, Statement B is true.

Statement C: "For both the years together, the average sales of Company 4 are lower than that of Company 3."

Average sales for Company 3:
$$\frac{ 75+80}{2} = 7$$​7.5 units

Average sales for Company 4:
$$\frac{80 + 70}{2}$$​ = 75 units

Company 4 has lower average sales than Company 3.

So, Statement C is true.

Statement D: "Total sales for both years across all companies are 800 motor bikes."

Total sales for both years across all companies:
400 (2017) + 400 (2018) = 800 units

So, Statement D is true.

Conclusion:

The statement that is not true is Statement A.