Can you show the steps to solve this?

Of four points are collinear, they are also coplanar

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.