Question
If only the upper 30% of a normally distributed class passed a quiz for which the mean was 70 and the standard deviation was 10, what was the lowest score a student could have received and still have passed?
Answers
PsyDAG
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.30) related to a Z score. Use the equation above to find the score.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.30) related to a Z score. Use the equation above to find the score.
sarah
64.8