The length of stay at a specific emergency department in a hospital in Phoenix, Arizona had a mean of 4.6 hours. Assume that the length of stay is exponentially distributed.
(a) What is the standard deviation of the length of stay?
(b) What is the probability of a length of stay of more than 10 hours?
(c) What length of stay is exceeded by 25% of the visits?

center (1,3) with radius 6

step-by-step explanation:

we must complete the square to find the center and radius of the circle.

first make sure the x and y squared terms have 1 as their coefficients. we also make sure x and y terms together.

we now create space between the x and y terms with parenthesis.

we complete the square by taking the middle terms -2x and the -6y - divide each and square them.

we add the squares to both sides.

simplify.

and write the quadratics in factored form.

the center is (h,k) or (1,3). the radius is the square root of 36 which is 6.

d is the answer

step-by-step explanation:

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation: