 Hi this is Dr. Don. I want to show you how to use StatCrunch to find a weighted mean, in this case a weighted score. I'm just going to click on to the copy to table icon, open in StatCrunch. StatCrunch loads the data for us. We've got a column labeled variable one which has the names of the various components of the grade, the score, and it says percent of final. I need to remember that, that these are percentages. So the way to do this more quickly is to use the data compute expression sequence, and we're going to build the equation. We want to take the score for each of those items, multiply it using the asterisk times the percent, and remember since the percent was not stated as a decimal we need to divide this by 100. Click OK, and that gives me my expression there, and I want to label this, and I click compute. And you can see we've now got a column with the weighted score for each of these five components of the final grade, and all we have to do to get the weighted mean is to add these up. And again I'm just going to go to data, compute, expression, build, and here we need the sum function, and I'm going to scroll down into this add function until I find sum. There we go. I did that because I can never remember what comes after the sum. We need the parentheses, and I'm just going to click on weighted score to insert that. Click OK, and then click compute, and there's my weighted mean score. So really that's pretty quick. I hope that helps.