Question 465167
the frequency distribution of scores on an examination is closely described by a bell shaped frequency curve and the distribution has a mean of 57.5 and a standard deviation of 10.
i) what percentage of candidates would be awarded grade A if the cut-off for grade A is 75 Marks?
-------------

z(75) = (75-57.5)/10 = 1.75
---
%(x > 75) = %(z > 1.75) = normalcdf(1.75,100) = 4.01%
==========================================================
Cheers,
Stan H.