For the purposes of constructing modified boxplots, outliers are defined as data values that are above Q3 by an amount greater than 1.5xIQR or below Q1by an amount greater than 1.5xIQR, where IQR is the interquartile range. Using this definition of outliers, find the probability that when a value is randomly selected from a normal distribution, is it an outlier. The probability that a random selected value taken from a normal distribution is considered an outlier is 0.0070.

For this problem I know the answer is 0.0070. However I am unsure of how to solve the problem. I know I must subtract Q3-Q1 , but I’m unsure of how to find the values to represent these quartiles.