molly is birdwatching at the coast. she has seen 2 egrets and 4 other birds. considering this data, how many…
molly is birdwatching at the coast. she has seen 2 egrets and 4 other birds. considering this data, how many of the next 39 birds molly sees would you expect to be egrets? egrets
Answer
Explanation:
Step1: Calculate the proportion of egrets
The total number of birds seen initially is $2 + 4=6$. The proportion of egrets is $\frac{2}{6}=\frac{1}{3}$.
Step2: Calculate the expected number of egrets
We expect the same proportion to hold for the next 39 - bird sample. So the expected number of egrets is $\frac{1}{3}\times39$. $ \frac{1}{3}\times39 = 13$.
Answer:
13