A population has a mean of 200 and a standard deviation of 50. Suppose a sample of size 100 is selected and x is used to estimate m.
a. What is the probability that the sample mean will be within ±5 of the population
mean?
b. What is the probability that the sample mean will be within ±10 of the population
mean?

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.

Land is to arable ; river is a, navigable b, shallow c, presumsor d, water

Jerrold has to buy 12 copies of a textbook which costs $36.25 per copy. how much must he spend for them?