A researcher has a colony of Bungo spiders in his lab.

Question

There are 1200 adult spiders in the colony, and the weights are normally distributed with a mean of 11 g and standard deviation of 2 g. What is the z-score of a spider in this colony that weighs 15 g?

Answer 1

z = (X - μ) / σ

z = (15 - 11) / 2