The standard deviation of a population is known to be 7.8. if the sample size is 85, what is the standard error of the mean? a. 0.22 b. 0.85 c. 1.047 d. 6.008

b. 0.85

Step-by-step explanation:

The formula to calculate the standard error is given by :-

We are given that the standard deviation of a population :

The sample size = 85

Therefore. the standard error of the mean is given by :-

Hence, the standard error of the mean = 0.85

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

answer: 7. if the functions had a negative leading coefficient and is of even degree, which statement about the graph is true?

step-by-step explanation: