Question

a scientist wants to find the average mass of fish living in a large pond. so she will use the masses of a sample of fish from the pond to find the average mass. answer the questions below. (a) which unit(s) could be used for the unit of measurement? check all that apply. minutes kilograms grams milligrams seconds (b) which of the procedures below would be the best way to find the average mass? pick 30 fish from a shallow region of the pond and estimate their masses. pick 7 fish from a shallow region of the pond and weigh each of them. randomly pick 30 fish from the entire pond and weigh each of them. randomly pick 7 fish from the entire pond and estimate their masses.

Explanation:

(a) Mass units are kilograms, grams, and milligrams. Minutes and seconds are time units.
(b) A larger random sample (30 fish) from the entire pond and actual weighing gives a more accurate average mass. Smaller sample size (7 fish) and estimation introduce more error. Sampling from only a shallow region is not representative of the entire pond.

Answer:

(a) kilograms, grams, milligrams
(b) Randomly pick 30 fish from the entire pond and weigh each of them.