The average 8-18 years old spends per day infront of a screen doing very little or no physical activity

Did the universe cool off or get hotter as it expanded after the 'big bang"?

Afarmer began a new method of reducing grain spills. this reduced the number of mice on the farm. the number of snakes in the surrounding area decreased at the same time. the snakes depended on the mice that lived in the field. what’s the likely reason the snake population decreased? a. the number of snake predators increased. b. the number of mice increased. c. the number of mice decreased. d. the pesticides affected the snakes. e. a new breed of mice moved into the field.

The difference between the observed value and the mean of the set of values is a