0. the first four moments about mean of a distribution are
0 = 16 pus = - 30 u = 40
test for the normality of the distribution.
groupe

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?