With an SD of 90, a raw score of 550 is at the 71st percentile, ...

[sheilaspns]

With an SD of 90, a raw score of 550 is at the 71st percentile, Find the mean of the raw score distribution.
 
  What will be an ideal response?

Question 2

When the standard deviation has a negative value, then
 
  a. most scores were above the mean
  b. most scores were below the mean
  c. the distribution is badly skewed
  d. none of these, since the standard deviation can never be negative

[milbourne11]

Answer to Question 1

M=500.50

Answer to Question 2

d