In this article we learn how we can calculate BAR GRAPH easily by solving most repeatedly asked questions in our examinations.

#### Guidelines:

**1.**Whenever we solve DI questions first we need to analyse the given data to proceed further.

**2.**Observe what is on x-axis and y-axis, Observe the colour for which it is specified.

**Directions: The following bar graph shows the total number of students appearing in an examination from two schools A and B over the years.**

__Ques.__What is the average number of students appearing from School A over the given period?
A. 705

B. 710

C. 715

D. 720

E. 725

C. 715

D. 720

E. 725

#### TRICK 1:

Observe the bar graph to find average never take a note of it and calculate. Calculate in your mind.

Take 700 as base (for example)

-60 +100 -200 0 +200 +50 =+90/6=15

700+15=715(answer)

**700+15=715**__Answer:__**640 800 500 700 900 750**__Explanation:__Take 700 as base (for example)

-60 +100 -200 0 +200 +50 =+90/6=15

700+15=715(answer)

#### TRICK 2:

Turn every year value to base value to perform simpler calculation

Take 700(2011) as base

Give 200(from 900-200=700) (2012) to (2010) 500+200=700

Give 50(from 750-50=700) (2013) to (2008) 640+50=690

Give 10(from 800-10=790) (2009) to (2008) 690+10=700

Left over is 90/6=15

700+15=715 ( Answer)

The above calculation seems to be lenthy but once we get habituate to calculate by visual inspection, calculating DI questions will become easy.

Take 700(2011) as base

Give 200(from 900-200=700) (2012) to (2010) 500+200=700

Give 50(from 750-50=700) (2013) to (2008) 640+50=690

Give 10(from 800-10=790) (2009) to (2008) 690+10=700

Left over is 90/6=15

700+15=715 ( Answer)

The above calculation seems to be lenthy but once we get habituate to calculate by visual inspection, calculating DI questions will become easy.

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