19. a spherical balloon has a circumference of 19cm. what is the approximate surface area of the balloon to the nearest square centimeter?
a) 114 cm^2
b) 460 cm^2
c) 361 cm^2
d) 1,134 cm^2

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