Calculate Margin of Error for a confidence interval of (1,9)

<-- Enter Confidence Interval, example 1,9
  

Calculate the margin of error and sample mean for a confidence interval of (1,9)

Calculate interval size:
Interval Size = 9 - 1
Interval Size = 8

Calculate the margin of error:
Margin of Error  =  ±Interval Size
  2

Margin of Error  =  ±8
  2

Margin of Error = ±4

Calculate sample mean:
The sample mean is just the midpoint of the confidence interval
Sample Mean x  =  Interval Size
  2

Sample Mean x  =  9 + 1
  2

Sample Mean x  =  10
  2

Sample Mean x = 5