Posted by Jerome on Sunday, June 23, 2013 at 5:00pm.
The National Highway Traffic Safety Administration analyzes the crash test data for new cars. One variable measured is the severity of the injury due to a collision. The higher the severity, the higher the points assigned. Assume that the injury rating is normally distributed with a mean (μ) of 605 points and a standard deviation (σ) of 185 points. One of the crashtest cars is randomly selected from the data and its rating is observed.
Find the probability that the rating will fall between 500 and 700 points.

statistics  MathGuru, Sunday, June 23, 2013 at 6:40pm
Use zscores.
Formula:
z = (x  mean)/sd
Find two zscores, using 500 for x and also 700 for x. Mean = 605 and sd = 185.
Once you find the two zscores, use a zdistribution table to determine your probability between the two zscores.

statistics  Anonymous, Tuesday, March 25, 2014 at 11:56pm
.4987
.4988
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