13. Old Faithful Find the best predicted time of the interval after an eruption (to the next eruption) given that the current eruption has a height of 100 ft.

x 0 2 1 4 8 y 6 5 4 0 6 Height 140 110 125 120 140 120 125 150 Interval after 92 65 72 94 83 94 101 87