This has been one of the most stressful homeschooling days I've ever had. My son is in the sixth grade and we are in a section on statistics. When I was in school, statistics was a college course. I knew a couple of schools that taught it as an honors course in high school. Pre-algebra was only available ahead of high school for AP students in the 8th grade. Here my son is in 6th grade and is learning Geometry and Algebra. I was never good in math, so I've had to do brush up work ahead of him so I can show him how. Well, then we hit statistics. I didn't take statistics until college! We spent 6 1/2 hours on math today and I've been tearing my hair out! I finally called my mom, who taught middle school math for a couple of years, and she had never heard of a box and whisker plot either. I called my college age daughter who is a math genius (I mean an Honors-college-calculus-in-11th grade math genius). She had never heard of it. I finally found a video on Youtube that explained it better than the book and teacher's guide and we managed to finally get past the first section. Then we go on to the next one and hit another brick wall in using the box and whisker plot to find the interquartile range and the mean absolute deviation. (HUH?) I finally called a few tutoring services and they were all prohibitively expensive. I didn't know what to do. After my 9th grader got home from school, I mentioned to her that we were struggling with it. Her answer? "Oh I know how to do that! I could show him." Grrr!
And there is the big disadvantage in "schooling at home" through an online school over "homeschooling". We use K12 online school, so I don't have as much authority as I would if we were simply homeschooling using our own curriculum choice.
Can't you just skip that section? I didn't take Stat until college also but I don't remember it. If it was me, I would skip that and teach what I believe is important.
I'm so sorry to hear you had such a hard day! Math is not my strong suit. My ds uses Math U See which comes with a dvd which I am thankful for. My dd is in high school also and will help my ds. Use your daughter as much as possible she probably enjoys it.