Question

The following table gives information about the marks obtained by 110 students in an examination.
Class Interval: 0-10, 10-20, 20-30,30-40,4-50
Frequency: 12, 28,32,25,13
Find the mean of the following distribution.

Answer 1

Answer:

number line among negative integers, 0 and positive integers.

   

    So, case 1: When a is any negative integer, that is, -a,

    then (−1) × (-a) = a

    So, case 2: When a is 0,

    then (−1) × 0 = 0

    So, case 3: When a is any positive integer, that is, a,

    then (−1) × a = -a

    Thus, the possible answers are a, 0 and -a.

(ii) (a) 

(b) −37×(−1)=37-37×-1=37

(c) 

Step-by-step explanation:

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