# NCERT Solutions for Class 9 Maths Chapter 14 Exercise 14.4

NCERT Solutions for Class 9 Maths Chapter 14 Exercise 14.4 statistics in English Medium and Hindi Medium free to use online or  download. NCERT Solutions for class 9 maths all chapters with complete explanations in PDF. Other exercises like Exercise 14.1 or Exercise 14.2 or Exercise 14.3 are given to use online or download to use it offline.

## NCERT Solutions for Class 9 Maths Chapter 14 Exercise 14.4

If you need solutions in Hindi, Click for Hindi Medium solutions of 10 Maths Exercise 14.4

Exercise 14.1

Exercise 14.2

Exercise 14.3

9 Maths Solutions – Main Page

### 9 Maths Chapter 15 Exercise 14.4 in Hindi

Exercise 14.1

Exercise 14.2

Exercise 14.3

9 Maths Solutions – Main Page

To get the solutions in English, Click for English Medium solutions.

##### Questions for Class 9 Maths – Statistics
1. The mean of the following data is 50.

xi     10     30     50     70     90

fi      17 5a+3    32   7a-11   19
Find ‘a’ and the mission frequencies for xi = 30, xi = 70. [Answer: a = 5 and missing frequencies are 28 & 24]

1. Draw a frequency polygon for the following data:
Marks       Frequency
0-10              03
10-20            09
20-30            18
30-40            16
40-50            12
50-60            02
2. If the 26 English alphabets are such that A = 1, B = 2, C = 3… Z = 26 then find the mean and median of the numbers corresponding to the vowels, which alphabet corresponding to the median. [Answer: I]
3. In a school a student who scored 80% or above in his/ her previous class is eligible for “Merit scholarship” Marks obtained by two students Nishi and Vinayak of class IX in their previous class (VIII) in all subjects are given below.

Name    Hindi     English     Maths     Science     SSt.     Skt.

Nishi        78            74             86             85           73       83

Vinayak   79            76             88             83           71       85
Find average percentage score of Nishi and Vinayak which of the two are eligible for merit scholarship? [Answer: 70.83, 80.33]

1. The blood group of 30 students of class IX are recorded as follows.
A, B, B, B, O, B, B, A, AB, A, O, B, O, A, B ABAB, A, AB, B, A, O, AB, B, A, O, B, AB, A, AB.

a) Make a frequency distribution table for the above data.

b) Mr. ‘X’ meets an accident and needs blood. His blood group is AB. How many of these students can donate their blood to Mr. ‘X’?

c) How many of the above students are universal donors and universal acceptors? [Answer: (a) 30, (b) 6, (c) 8]

1. 15 students of Govt. school spend the following numbers of hours in a month for doing cleaning in their street 25, 15, 20, 20, 9, 20, 25, 15, 7, 13, 20, 12, 10, 15, 8.

i) Find mean, Median and mode from above data.

ii) Which value is depicted from above information? [Answer: Mean = 15.6, Median = 15, Mode = 20, Social Work]

1. In an assembly election the number of seats won by the different political parties is shown below.
Party             A    B    C    D    E    F    G
No. of Seats 1     4     7    15   2     19   15

i) Draw a bar graph.

ii) Which political party won by availing maximum number of seats.

iii) What is the minimum age of a voter to cast his/ her vote in India in assembly election?

1. The following table shows no of voluntary blood donor as per day in voluntary blood donation camp organized by Govt. of Delhi.
Days               No. of Donors
Sunday                  100
Monday                  80
Tuesday                 110
Wednesday             80
Thursday                 60
Friday                      70
Saturday                120
Draw a bar graph showing above information.

i) In which day donation was maximum and in which day it was minimum.

ii) Why blood donation is necessary?