A 30 item math test was graded using the following procedure: a correct response was scored as +1, a blank response was scored 0, and an incorrect response was scored -1. The maximum possible test score was 30; the lowest score possible was -30. The standard deviation of the test scores for the class was reported to be -2.13. Therefore, A. some students received negative scores B. the test was too hard for this class C. the class performed poorly on this test D. a calculation error was made in determining the standard deviation E. most students received positive scores

i dont know men

step-by-step explanation:

the answer would be d.

step-by-step explanation:

move all variables to the left side and all constants to the right side

(x−3)^2+(y−1)^2=16

this is the form of a circle. use this form to determine the center and radius of the circle.

( x − h ) 2 + ( y − k ) 2 = r 2

match the values in this circle to those of the standard form. the variable   r   represents the radius of the circle,   h   represents the x-offset from the origin, and   k   represents the y-offset from origin.

r = 4

h = 3

k = 1

the center of the circle is found at   ( h , k ) .

center:   ( 3 , 1 )

these values represent the important values for graphing and analyzing a circle.

center:   ( 3 , 1 ).

radius:   4

no its the same as every other grade

step-by-step explanation: