1. Activity As you noticed the extreme value 900 for HR has inflated the mean to over 100 and also the standard deviation. Our goal here is to try to get more outliers. so let's calculate the mean and the standard deviation with excluding that extreme value. Reuse proc means of the program 5.1. by excluding the value 900 for HR (use where clause). print the content of Mean_Std Examine the mean value. Now we have the adjusted mean and standard deviation (without considering the extreme value 900), we want to flag all values more than two standard deviations from the adjusted mean as outliers. Reuse the data null step code from program 5.1. as it is and show the output.*/