Sarah family went to chick Fil a and spent $32.83. Her mom and dad got the meals that cost $8.99 each, and her and her siblings each got a meal that cost $4.95 each. What would equation look like

4. jake needs to score in the top 10% in order to earn a physical fitness certificate. the class mean is 78 and the standard deviation is 5.5. what raw score does he need? z value for top 10% =1.282 how do i get the z value? what is the equation for this? raw score =mean+z*sd = 78+1.282*5.5 = 85.051