Hello students! Welcome to **DILR Concept 7**

**Concept name:****– **Bar Graphs

**Concept explanation****: **Bar Graphs visually represent data in the form of bars representing data on y-axis with the title on x-axis. One needs to interpret the data and answer questions accordingly

**Sample set: Read the information given below and answer the questions that follows:**

Q1) If the stability of the production during 1990 to 1995 is defined as

Stability = (Average Production)/ (Max Production- Min Production) , then which product is most stable?

Q2) Individual revenue of P, Q, R and S for the entire period (1990 – 1995) is calculated based on the price of Rs. 9, Rs. 4, Rs. 13, and Rs. 3, respectively. Which product fetches the lowest revenue?

(a) Product P (b) Product Q (c) Product R (d) Product S (e) Cannot be determined

**Solution**

We first make a table of Production of P,Q,R and S year wise

P | Q | R | S | Total | |

1990 | 45 | 99 | 75 | 115 | 334 |

1991 | 25 | 41 | 93 | 158 | 317 |

1992 | 40 | 108 | 107 | 166 | 421 |

1993 | 38 | 60 | 63 | 139 | 300 |

1994 | 76 | 41 | 132 | 88 | 337 |

1995 | 56 | 70 | 120 | 97 | 343 |

Total | 280 | 419 | 590 | 763 | 2052 |

Now stability of P= (280/6)/(76-25) =0.92

Similarly stability for Q,R and S are 1.04,1.43, and 1.63 respectively.

Hence , product S is most stable

Now for calculating revenues, we multiply number of product of each category with their price.

For P=> Revenues= 280*9=Rs 2520

Similarly for Q,R and S, Revenues are Rs 1676. Rs 7670 and Rs 2289.

So Product Q fetches the lowest revenue.

**Level of difficulty: Easy**

**Hope you understood solving questions on Bar graphs**

Happy learning!

Rahul Sir

CAT Coach

Quora profile: https://www.quora.com/profile/Rahul-Anand-51