Question 1192122
Here's how to determine if 8 out of 9 adults needing vision correction is significantly high:

1. **Define "Significantly High":**  We need to establish a threshold for what we consider "significantly high."  A common approach is to use the range rule of thumb, which considers values outside of two standard deviations from the mean as significantly different.

2. **Calculate the Mean (μ):**

   μ = n * p = 9 * 0.71 = 6.39

3. **Calculate the Standard Deviation (σ):**

   σ = sqrt(n * p * (1-p)) = sqrt(9 * 0.71 * 0.29) ≈ 1.36

4. **Calculate the Range of Usual Values:**

   * Lower Bound: μ - 2σ = 6.39 - 2 * 1.36 ≈ 3.67
   * Upper Bound: μ + 2σ = 6.39 + 2 * 1.36 ≈ 9.11

5. **Compare the Observed Value:**

   The observed value is 8.

6. **Make a Decision:**

   Since 8 falls within the range of usual values (3.67 to 9.11), it is *not* considered significantly high.

**Conclusion:**

8 adults needing vision correction out of 9 randomly selected adults is within the expected range based on the given probability.  Therefore, it is not considered a significantly high number.