Determine the center and radius of the following circle equation: x
2
+
y
2
−
2
x
+
8
y
−
32
=
0
x
2
+y
2
−2x+8y−32=0

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.