Why cant underground water cleanse itself?

The probability of rolling a sum of 7 when rolling two dice simultaneously is 0.167. you decide to test that probability by rolling th dice 12 times. what is the probability that exactly 2 of the rolls is a sum of 7?

Aschool principal trying to find out if parents will buy new playground equipment shows digital leadership by

Which of the following would most likely be a preservationist, as opposed to a conservationist, approach to public land management? i. allowing unrestricted boat access to a lake ii. allowing atv use in all areas of public land iii. closing fragile sections of a park to tourists i only ii only iii only i and iii ii and iii