Question
In a sample of 1000 tires, with a mean of 250 miles per tire....about how many tires will last longer than 300 miles?
Answers
PsyDAG
Need to know standard deviation (SD).
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability for the Z score. Multiply by 1000.
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability for the Z score. Multiply by 1000.