The average college lecture hall (auditorium) can seat 60 students with a standard deviation of 21. Assume that a total of 60 lecture halls are selected for a sample. What is the standard deviation for the sample mean?

The standard deviation of the sample mean is  

Step-by-step explanation:

From the question we are told that

   The mean is  

    The standard deviation is  

     The sample size is

Generally the standard deviation of the sample mean is mathematically represented as  

substituting values

step-by-step explanation:

i could only see the first page. the other pages were blurry. ; -;

x hot dogs for 2$, y drinks for 3$. 29 items and total 70

2x+3y=70

x+y=29

if x=17and y=12

2(17)+3(12)=70

34+36=70