In an all boys school, the heights of the student body are normally distributed with a mean of 68 inches and a standard deviation of 4.5
inches. Using the empirical rule, what percentage of the boys are
between 54.5 and 81.5 inches tall?

c

step-by-step explanation:

70

step-by-step explanation:

given : the shape of his satellite can be modeled by   where x and y are modeled in inches.

now,the given equation   is a equation of parabola.

here, coefficient of x is positive, hence the parabola opens rightwards.

on comparing this equation with standard equation , we get

in standard equation, coordinates of focus=(0,m)

thus for given equation coordinates of focus=(0,1.5)

step-by-step explanation: