About 95% of rats weight is between 2.5+2 *standard deviation=2.5+2*0.5=2.5+1=3.5 and 2.5-1=1.5 (1.5,3.5). About 68% of rats weight is between (2.5-1*standard deviation, 2.5+1*standard deviation), (2,3).
This means that about 68 percent of rats in the city weigh between 2 pounds and 3 pounds. (solution b)
When you place the points in the values, you get 5=3(0)+b. When you simplify it, you get 5=b. I really hope this is correct, I apologize if it isn't! I hope this helps! :)
