Telangana SCERT Class 9 Math Solution Chapter 9 Statistics Exercise 9.1

Telangana SCERT Solution Class IX (9) Math Chapter 9 Statistics Exercise 9.1

(1) Mark wise frequencies of the frequency distribution table.

 Marks 5 6 7 8 9 10 Frequency (f) 5 11 – 5 = 6 19 – 11 = 8 31 – 19 = 12 40 – 31 = 9 45 – 40 = 5

(2) The frequency distribution table for the following students

 Blood group A B AB O Frequency(f) 10 9 2 15

The most common blood type is O

The rarest blood type is AB

(3) The frequency distribution table from the given as follows.

 No of Heads 0 1 2 3 Frequency (f) 3 10 10 7

(4) The frequency distribution from the given data is as follow

A – Complete prohibition

B – Prohibition in public places only

C – Not necessary

 Types of SNS A B C Frequency (f) 19 36 10

In my opinion B is the appropriate choice.

The majority of people opinion tilted towards option B which is prohibition in public places only.

(5) The frequency distribution table from the given is as follows: –

 Types of vehicle Cars Bikes Autos Cycles Frequency(f) 25 45 30 40

(6) The scale of the given graph is as follows: –

On X axis 1 cm = 1 class interval

On Y axis 1 cm = 10 students

The frequency distribution table from the given graph is as follows: –

 Class Class – I Class – II Class – III Class – IV Class – V Class – VI No of Students (f) 40 55 65 50 30 15

(7) The frequency distribution tables from the given data is as follows: –

 Marks (class interval) 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 No of students (f) 1 4 3 7 7 7 1 0

(8) Given,

Class size is 75

The frequency distribution table from the given data is as follows: –

 Electricity Bill in (₹) [class interval] No. of houses (f) 0-75 0 75-150 0 150-225 4 225-300 3 300-375 7 375-450 7 450-525 0 525-600 1 600-675 1 675-750 2

(9) The frequency distribution table form the given data is as follow

Class size = 0.5 starting from 2 – 2.5

 Life time of Bathu’s (in year) 2-2.5 2.5-3.0 3.0-3.5 3.5-4 4-4.5 4.5-5 No of Batteries (f) 2 6 14 11 4 3
Updated: September 21, 2021 — 4:47 pm