Question 651:

Asked on March 9, 2009

1

Answer:

No answer provided yet.To answer this question we need to use the formula for a z-score around a single data-point.  The formula is (data-point-mean )/standard deviation. For this data we have (71-80)/12, which gives us a z-score of -0.75. The z-score is negative because the raw score is below the mean.  If the raw score was above the mean it would be positive (0 if it equalled the mean).  We'd say this raw score is .75 standard deviations BELOW the mean.