A local municipality did a census of earthworms per acre of soil for 15 similar sites and found that the standard deviation of the number of worms per acre was 2,000. Was the standard deviation of the number of worms per acre at the 15 sites higher at the end of the year?

(1) By the end of the year, the range of the number of worms per acre for the sites had increased by 20%.

(2) The number of worms in each plot increased by the same percentage.


OA B

Source: Veritas Prep