4. Describe in words the population, estimated parameter, and random variable in the context of the problem. If the population which is sampled from differs from the population of interest, explain briefly what the difference is.
(a) A researcher investigating the health of North Atlantic right whales randomly samples 10 radio-tagged NA right whales, locates each one during a three-day period around August 23, 2025 and measures the length of each whale in metres. The sample mean of the lengths of the whale is calculated.