Final answer:
To estimate the number of jellybeans in the jar, there are two good methods: weighing the jar and dividing the weight by the weight of a single jellybean, or counting the number of jellybeans in a small sample and using that as a representative sample.
Step-by-step explanation:
To estimate the number of jellybeans in the jar, one way is to weigh the jar and divide the weight by the weight of a single jellybean. This method assumes that all jellybeans weigh the same. Another way is to count the number of jellybeans in a small sample and use that as a representative sample of the entire jar. For example, if you count 10 jellybeans and 2 of them are red, you can estimate that 20% of the jellybeans in the jar are red.
Therefore, to estimate the number of jellybeans in the jar, I would suggest either weighing the jar and dividing the weight by the weight of a single jellybean, or counting the number of jellybeans in a small sample and using that as a representative sample.