Answer: 1.75
Step-by-step explanation:
The formula to find the standard error is given by :-
[tex]S.E.=\dfrac{\sigma}{\sqrt{n}}[/tex]
Given : The sample size : n = 36
The distribution of speeds of all trucks on this section of highway is normally distributed with standard deviation : [tex]\sigma=10.5\text{ mph}[/tex]
Then , the standard error of the mean will be :-
[tex]S.E.=\dfrac{10.5}{\sqrt{36}}=1.75[/tex]
Hence, the value to use for the standard error of the mean is : 1.75
