### Home > CCA2 > Chapter 10 > Lesson 10.3.1 > Problem10-152

10-152.
1. Parking meters in a beach resort town cost 25¢ for 15 minutes. A normal distribution with a mean of $10 and a standard deviation of$2 can be used to model the amount of money one parking meter makes on a busy summer day. 10-152 HW eTool (Desmos). Homework Help ✎

1. Make a graph of the distribution of the money made by one meter on your calculator, and sketch it. An appropriate value for the maximum of the relative frequency axis is Ymax = 0.2.

2. From your graph, visually estimate where the middle 90% of meter earnings fall. Shade this portion of your sketch.

3. Use your calculator to check your estimate. How close to 90% did you come?

normalcdf(lower estimate, upper estimate, 10, 2) = 0.90

Use the eTool below to help solve parts (a - c).
Click the link at right for the full eTool version: CCA2 10-152 HW eTool