Friday, November 2, 2012

Math Question of the Week- November 5th

Local residents have requested a traffic light at the intersection of Polk Road and Vine Street. They claim that the intersection has become unsafe for their children due to the high volume of drivers using these roads as shortcuts during rush hour from 4 p.m. to 6 p.m.

In response, the street department installed a device that would count cars going through the intersection. The device counted the total number of cars each day for a two-week period. The department used the results to determine the average number of cars passing through the intersection each day. They decided the number was normal for an intersection with no light, and refused the residents’ request.

Explain how the residents can claim that the method the department used to collect the data does not provide valid information for evaluating their request.

Explain how the department’s method can be altered to provide more valid data.

Be sure to use complete sentences.


  1. the device they installed might be faulty and the intersection couldn't get the accurate number of cars but they could only have the device on from 4pm to 6pm and see how many cars pass through each minutes

  2. The device could stay on more and through out the week. Keeping the device on more will give them probably more results the on a regular day.