In 2019, 65% of Americans under age of 30 uncertified as none denomination Christian. A research wants to know if that percentage has decreased. 50 Americans under age 30 are selected random. Out of those 27 identified as nondenominational Christian. Find observe value.

Given:
- In 2019, 65% of Americans under the age of 30 were identified as nondenominational Christian.
- 50 Americans under the age of 30 were randomly selected for a research study.
- Out of the 50 selected, 27 identified as nondenominational Christian.

To find the observed value, which is the number of people who identified as nondenominational Christians out of the total number of people surveyed (50), we can follow these steps:

1. Calculate the percentage of people who identified as nondenominational Christian out of the total number surveyed:
\frac{27}{50} \times 100\% = 54\%

2. Therefore, the observed value is 54%.

\boxed{54\%}