# Data Interpretation - Bar Charts - Discussion

Discussion Forum : Bar Charts - Bar Chart 2 (Q.No. 1)
Directions to Solve

The bar graph given below shows the foreign exchange reserves of a country (in million US \$) from 1991 - 1992 to 1998 - 1999.

Foreign Exchange Reserves Of a Country. (in million US \$)

1.
The ratio of the number of years, in which the foreign exchange reserves are above the average reserves, to those in which the reserves are below the average reserves is?
2:6
3:4
3:5
4:4
Explanation:

Average foreign exchange reserves over the given period = 3480 million US \$.

The country had reserves above 3480 million US \$ during the years 1992-93, 1996-97 and 1997-98, i.e., for 3 years and below 3480 million US \$ during the years 1991-92, 1993-94, 1994-95, 1995-56 and 1998-99 i.e., for 5 years.

Hence, required ratio = 3 : 5.

Discussion:
17 comments Page 1 of 2.

Can any one explain this clearly.

For this we are calculating average oa all the Foreign Exchange Reserves. then we are comparing the data that which is above and which is below.Clearly in the 1992-93, 1996-97 and 1997-98 years are above the Foreign Exchange Reserves and 1991-92, 1993-94, 1994-95, 1995-56 and 1998-99 are below.clearly the ratio is 3:5

Explain it clearly.

Average foreign exchange reserves over the given period =

(2640+3720+2520+3360+3120+4320+5040+3120)/8= 3480 million US \$.

The country had reserves above 3480 million US \$ during the years 1992-93, 1996-97 and 1997-98, i.e., for 3 years and below 3480 million US \$ during the years 1991-92, 1993-94, 1994-95, 1995-56 and 1998-99 i.e., for 5 years.

Hence, required ratio = 3 : 5.
(3)

Thanks poonam explained in such a easy way.

Easy method to do average without addition?

We have.

(2640+3720+2520+3360+3120+4320+5040+3120) /8=3480.

As per graph 3 country reserves are above ratio (ans is 3).

Now again 5 Country reserves are below average.

Then Ratio between Above avg: Below avg is. 3:5.

Rinchen Kinley said:   8 years ago
To find the average we have to find the sum of all the data and then divide it by the number of data, but here we don't calculate the average like this. We just take the sum of all the data.

Can someone help me why it is so?

Kirti said:   8 years ago
Please tell how to visually look at the average?

Uday said:   8 years ago
@Rinchen Kinley that's is the formula! for taking the average and that's what they did! the sum of all the data by a number of observations.