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6-86.
  1. Parking meters in a beach resort town cost 25¢ for every 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. 6-86 HW eTool (Desmos). Homework Help ✎

    1. Make a graph of the distribution of the money made by one parking meter on your calculator, then sketch it. An appropriate value for the maximum of the relative frequency axis is Ymax = 0.25.

    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) through (c).
Click the link at right for the full eTool version: INT3 6-86 HW eTool