Final answer:
The level of measurement for the variable 'Weight of a child' is ratio level.
Step-by-step explanation:
The level of measurement for the variable 'Weight of a child' is ratio level.
Ratio level variables have all the characteristics of interval level variables, but they also have a true zero point, meaning that the absence of the characteristic being measured is represented by a zero value. In this case, a weight of zero indicates the absence of weight.
Examples of other ratio level variables include height, age, and income.