A wildlife biologist examines frogs for a genetic trait that may be linked to toxins in the environment. Previous research had estimated that this trait is usually found in 1ofevery8 frogs. The biologist decides to collect and examine 150 frogs.

mean = 18.75

std = 4.05

o} The biologist found the trait in 25 of his frogs. Do you think this proves that the trait has become more com mon? C} A. No, because 25 is not more than 3 standard deviations from the mean. C} B. No. because 25 is more than 3 standard deviations from the mean O C. Yes, because 25 is not more than 3 standard deviations from the mean C} D. Yes, because 25 is more than 3 standard deviations from the mean