ASSIGNMENT 03_18.10.2018

           DASS AND BROWN WORLD SCHOOL

Class IX     ASSIGNMENT NO -03 (18.10.2018) 

Q1. Prove that a diagonal of a parallelogram divide it into two congruent

      triangles.

Q2.Prove that the sum of angles of a quadrilateral is 360⁰ .

Q3.The monthly wages of 30 workers in a factory are given below:- 830, 835,

      890, 810, 835, 836, 869, 894, 898, 890, 820, 860, 832, 833, 855, 845, 804,

      808, 812, 840, 885, 835, 836, 878, 840, 868, 890, 806, 840, 890

Form frequency distribution table with class size 10

Q4.Draw histogram and frequency polygon.

Marks	No. of students
0-10	5
10-20	10
20-30	4
30-40	6
40-50	7
50-60	3
60-70	2

Q5.The following are the scores of two groups of class IX students in a test.

Scores	Group A	Group B
32-34	4	2
35-37	10	3
38-40	15	4
41-43	18	8
44-46	20	12
47-49	12	17
50-52	13	22

                Compare the scores of two groups by using frequency polygon.                    

Q6. If the mean of the following distribution is 6, find the value of P.

X	2	4	6	8	P+5
F	3	2	3	1	2

Q7.The mean monthly salary of 10 members of a group is Rs 1445, one more

      member whose monthly salary is Rs 1500 has joined the group.

      Find the mean monthly salary of 11 members.

Q8.Tom draws a marble from a bag containing 12 marbles. There are 3 red

      marbles, 4 blue marbles and 5 green marbles, find the probability that he

      will draw a blue marble.

Q9.1000 families with 2 children were selected randomly and the following data

      was recorded:

No. of girls in a family	0	1	2
No. of families	200	500	300

If a family is chosen at random, compute the probability that it has

a)    no girl, (b)  atleast one girl

Q10. Find the area of triangle by using Heron’s formula. Sides of the triangle

      are 11cm, 12cm and 13 cm

Date of submission :- 22.10.2018