Question

IV. DO THE FOLLOWING :                                                              (4 x 5=20)

Number of children in six different classes are given below .Represent the data on a bar graph:

Class
Fifth
Sixth
Seventh
Eighth
Ninth
Tenth
No. of children
135
120
95
100
90
80


a) How would you choose a scale ?
b) Which class has the maximum number of children? And the Minimum?
c) Find the ratio of students of class sixth to the students of class eighth?
2. Simplify the expressions :
  if (x=3, a= -1, b=-2 )    a) 3x-5-x+9  ; b) 2-8x+4x+4
3. Using laws of exponent: a)  (52)3 ÷ 53 
                                                 b) a4 x b4  
4. Subtract : 24ab – 10b – 18a from 30ab+ 12b+ 14a
     Add : -7mn+5, 12mn+2, 9mn-8 , -2mn-3  
​

Answer 1

Step-by-step explanation:

1) First,

A) scale = 1 = 5 person

B) Maximum = 135 ( fifth) Minimum = 80 ( Tenth )

C) Ratio = 5:6