suppose that out of 10 trees planted in a yard only five survived. what kind of hypothesis could make about this observation for event.

Answer:
The 5 trees that did not live couldn't receive nutrients as well as the others.
Explanation:
A hypothesis doesn't have to be a perfect statement, it is mainly a scientific guess that is further taken to the experimental level and research level. Your answer could consist of anything as long as it makes logical sense.
Answer:
Hypothesis: The yard doesn't have suitable environmental conditions necessary for the plants to live, that's why only half of the trees survived.