B³(cm)³ respuesta plis

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.

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”?

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).