a man deposited sh 10542 in a bank offering a compound interest of 10% per year .The interest is given after every 5 months calculate total savings after 8 years​

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”?