Question

Suppose that a normal model describes the aciditv (pH) of rainwater, and that water tested after last week's storm had a 2-score of 1.8 This means that the acidity of the rain:

Answer 1

In statistics, a Z-score (or standard score) measures how many standard deviations an element is from the mean. A Z-score of 1.8 indicates that the acidity of the rain, represented by its pH, is 1.8 standard deviations above the mean acidity level as described by the normal model. This suggests that the rainwater's acidity is relatively high compared to the average acidity level.