 Okay Abigail, I'm back with the rest of this M3A1 problem number 4 on the histogram data. And we're going to look at the way that you've got your counts here. Now I've gone ahead and used the formula text. Remember that's the formula up there, formula text, type that in and then give it the cell reference. And these are the formulas we have there. The first one you did right, using the count and you gave it the range, the correct range and the count counts all cells that contain a number which is 5,000 which is correct. The second cell you did correct again, the count of cells that are less than 3,000. You used the count ifs function. Now that will work and it did work correctly. The count ifs allows you to put in more than one specification or criteria as well as more than one range. And that's what you need to do. This next cell you use count and then divide. Now this is a simple division and all you need to do there is just put equal. I want the count of less than 3,000 divided by the total count gives you the .36 or 36.4 percent probability that the value would be less than 3,000 hours. Okay, the next cell you want the count greater than 4,200. Now you use count ifs again which is okay but over here you made another typo. You see there you've got the quotation marks both before the value. So we need to go in there, edit that, I'm going to delete that quotation mark, put the quotation mark in the right place and now you've got the correct value. We've got the same problem in this next cell that should just be equal 801 divided by the total count which would be 16 percent. The next cell you've got a compounding error here. First of all you're back using count. Count doesn't let you put in criteria, it just counts the number of cells with a number in them and of course that's not what you're doing here. You need to count ifs because you've got two criteria. So let me edit that, I'm going to go back in here and put ifs and click enter and now we've got something 41.99 but it's not the right answer because you've got a mistake in the criteria. We want between 4,200 and 4,500 and what you've got there for your criteria it's counting less than 4,200 and then also less than 4,500 and adding those. So we need to edit this again, I'm going to go up here and I'm going to change that less than to a greater than hit enter and now we've got the correct count of the hours that are between 4,200 and 4,500. The last one we just need to get rid of that count equal 499 divided by the total count which is approximately 10%. So that's all you need to do. Be more careful when you're typing, look for the punctuation and also be aware that count, count if and count ifs are different functions, count just counts cells with a number, count ifs gives you one criteria, one range pair, count ifs with the s gives you multiple ranges with multiple criteria. So be careful, hope this helps.