Suppose the profit the company makes on each customer visit is $0.75 per dvd minus $0.05 "fixed costs." that is, if p = profit, then p x  0.75 0.05.  use a linear transformation of your results in (a) and (b) to find the mean and standard deviation for p.

Step-by-step explanation:

Given that the profit the company makes on each customer visit is $0.75 per DVD minus $0.05 "fixed costs."

i.e. Profit

= P(x) = 0.75 x - 0.05  where x is the no of dvds sold

E(x) =

(using linear transformation rules for mean)

VarP(x) =

Hence std dev P(X) = 0.75 std dev (x)

answer: 12

step-by-step explanation:

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.