Why do we often create a confidence interval for a population mean? Select one:
a. We estimate the population mean with the sample standard deviation. The distribution of the sample standard deviation can often be well approximated by a normal distribution.
b. The mean is the ideal summary of a distribution. Given a population mean you don't really need anything else.
c. We estimate the population mean with the sample mean. The distribution of the sample mean can often be well approximated by a normal distribution.
d. We estimate the population mean with the sample mean. The mean is something most people understand.

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'.

r and t.

both are 64 degrees.

c.

step-by-step explanation:

simple you would first have to get   a negative number where as 1 to be multiplied by 24 and then you would have to multiply 6 time 4 and then repeat that process until you reach your term