David often finishes his test before anyone else in the class, but he finds that he misses questions for which he knew the correct answer and thought he'd answered right. what is the likely reason for this situation?

The reason being is that he could have been rushing to get done before anyone else. Thus him mis reading and getting the wrong answers.

12.4%

Step-by-step explanation:

The results from the random sample counts 124 from a total of 1000 people that wear contact lenses. This means is the percentageof the people in the sample that wear contact lenses.Because it is a random sample, it is suppose to reflect the behavior of the total population. Then we can expect or predict  similar percentage of Americans wearing contact lenses (12.4%).