Foundations of Measurement
posted by Dawn .
Approximately 400,000 students took the GRE in 2009. Observed mean for the Verbal score was 540 with a standard deviation of 80, and the observed mean quantitative score was 500 with a standard deviation of 100.
Assuming distribution was normal, answer the following:
How many students scores are below the mean?
How many students scores are above the mean?
How many students scores fall between one standard deviation below and above the mean?
How many students scores are higher than two standard deviations above the mean?
I am so confused!! I've watched countless videos and read, and re-read the power points...I can't wrap my brain around this...please help!!
Foundations of Measurement -