Danielle ran a total of 15 miles over the course of 5 track practices. how many track practices would it take for danielle to run 18 miles? assume the relationship is directly proportional.

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.