Question

a clinic measured the systolic blood pressure for a random sample of 10 patients. the resulting 95% confidence interval for the mean systolic blood pressure of all the patients at this clinic was (111.3, 129.5). what was the mean systolic blood pressure from the sample of 10 patients?18.2111.3120.4129.5

Explanation:

Step1: Recall confidence interval property

The sample mean is the midpoint of a confidence interval for the population mean.

Step2: Calculate midpoint of interval

$$\text{Sample Mean} = \frac{111.3 + 129.5}{2}$$
$$= \frac{240.8}{2} = 120.4$$

Answer:

120.4