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Question

The variable type and the correct relation between Running time (a) and Maintainance cost (z) is-
Running time (a) 3 7 11 15
Maintainance cost (z) 9 17 25 33

  1. z—Independent, a—Dependent z=2a+3
  2. z—Dependent, a—Independent and z=2a+3
  3. z—Dependent, a—Independent and z=3a+2
  4. z—Independent, a—Dependent and z=3a+2


Solution

The correct option is B z—Dependent, a—Independent and z=2a+3
From the table:
Running time (a) 3 7 11 15
Maintainance cost (z) 9 17 25 33
it can be observed,
3×2+3=9
7×2+3=17
11×2+3=25
15×2+3=33
hence,
z=2a+3
where 'z' is dependent and 'a' is independent.

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