Answer:
The value is 
Step-by-step explanation:
From the question we are told that
The sample size is n = 20
The sample mean is 
The standard deviation is 
Generally the standard error of the mean is mathematically represented as

=> 
=> 
Answer:
Step-by-step explanation:
X intercept: when y = 0
Or coordinates: (x, 0)
On the graph it’s: (-2, 0)
On the function, plug in y = 0
2x - 4(0) = 8
2x - 0 = 8, x = 4
The graph x intercept is -2
The function x intercept is 4
Solution: function x intercept is greater

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