A certain standardized test's math scores have a bell-shaped distribution with a mean of 520 and a standard deviation of 119. Complete parts (a) through (c).
(a) What percentage of standardized test scores is between 401 and 639?
68.3% (Round to one decimal place as needed.)
(b) What percentage of standardized test scores is less than 401 or greater than 639?
31.7% (Round to one decimal place as needed.)

ANSWER QUESTION C

C. What % of standardized test scores is greater than 758?

___%

(Round to 1 decimal place as needed)

Please give explanation