an article in health magazine suggested getting a dog to encourage more regular walking. A researcher for the article found that the distribution of time spent walking dogs was approximately normally distributed with a mean of 39 minutes per day. However, he also found that 13% of dog owners walk their dogs for less than 20 minutes per day. What is the standard deviation of the time, in minutes, dog owners walk their dog per day?

christopher is 272,195 year old

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

a is the best answer choice