Answer:
Standard error
Step-by-step explanation:
The standard deviation of the distribution of sample means is called the standard error of the means.
It is denoted by: 
The standard error is calculated using the formula: 
where n is the sample size and
is the population standard deviation.
all the answers would be irrational.
Answer:
A
Step-by-step explanation:
if negative means hikers are below her, than the one she is rescuing is below her