Gram and kilogram are the units which could be used for the measurement of average mass of fish.
For calculating average the best way is to randomly pick 52 fish from the entire pond and weigh each of them.
The quantity of a constant magnitude which is used to measure the magnitudes of other quantities of the same nature is called unit.
The average value is a set of numbers is the middle value, calculated by dividing the total of all the values by the numbers of values.
According to the given question
"A scientist wants to find the average mass of fish living in a large pond".
(a). As we know that 'hours' and 'seconds' are the units of time. And the unit milligram is too small to measure the masses of fish.
Therefore, gram and kilogram are the units which could be used for the measurement of average mass of fish.
(b). Since, average value is a set of numbers is the middle value, therefore for calculating average the best way is to randomly pick 52 fish from the entire pond and weigh each of them.
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