Waiting for answer This question has not been answered yet. You can hire a professional tutor to get the answer.

# Psychomotor retardation scores for a large group of manic-depressive patients were approximately normal, with a mean of 930 and a standard deviation...

Psychomotor retardation scores for a large group of manic-depressive patients were approximately normal, with a mean of 930 and a standard deviation of 130. What fraction of the patients scored: a) between 800 and 1,100? b) less than 800? c) greater than 1,200?