What is the probability that when a coin is flipped 6 times it lands heads up every time?

Based on what i know about mean, this doesn't add up.

Through non-collinear points there is exactly one plane.

Abby is collecting rainfall data. she finds that one value of the data set is a high-value outlier. which statement must be true? abby will use a different formula for calculating the standard deviation. the outlier will increase the standard deviation of the data set. the spread of the graph of the data will not change. abby will not use the mean when calculating the standard deviation.