A Study Finds That a Simple Random Sample of 57

Multiple Choice

A study finds that a simple random sample of 57 butterflies captured in a given natural habitat is made up of 12 blue, 19 yellow, and 26 white butterflies. We want to know if this is significant evidence that blue, yellow, and white butterflies are not equally represented in the habitat's population of butterflies. Under the null hypothesis of equal representation of the three butterfly colors, what is the expected count for blue butterflies?

A) 10
B) 12
C) 19
D) 28.5