Normal distribution introduction [IB Maths AA SL/HL]

[@its_merida]

Honestly, i prefer to watch your videos over attending my online classes. My teacher goes so slow and you cover the entire topic in under an hour. Very grateful for your efforts!

[@OSC1990]

Wow, thanks!

[@annachernikova698]

Thank you so much, your explanations are amazing, you’re the first person who made me feel confident about the normal distribution!

[@OSC1990]

That's wonderful to hear. I'm so happy to help! And don't worry, it's NORMAL to struggle with this topic - once you see how it works, I hope it's simpler for you :) Cheers, Mitch

[@Siu76_______x]

thanks man these videos are a big help, im really nervous for the finals but hopefully god willing I do well

[@OSC1990]

I'm sure you will do great! Just remember to stay as calm as you can, breathe, you can do this! :)

[@excusemyhonesty9740]

thank you so much for your math and physics videos. i had a tough start to exam season with covid and anxiety, and your videos helped me so much to study and do my best regardless! i really appreciate your work.

[@OSC1990]

You're so very welcome! I appreciate your kind words. It's perfectly normal to have anxiety about maths, it can be a really tough subject. Just remember to take your time, and do your best. Doesn't have to be perfect. Your own health and well being are so important - maths will be over before you know it. Cheers, Mitch

[@melaniet179]

how do you know the area is 0.2839 for part b?

[@OSC1990]

They tell us that 28.39% of babies have a weight between 3.19 kg and 3.59 kg.So I draw that area from 3.19 to 3.59, and I assign it a probability: 28.39% = 0.2839

[@melaniet179]

@@OSC1990 thank you for the clarification!

[@sirdarren6507]

sir, good day, How can I solve for missing standard deviation with the same example you presented?

[@OSC1990]

If you're given boundary conditions and let's say the mean, then you CAN find the standard deviation. What you do it use InverseNormal. That has you plug in the area (set mean = 0, standard deviation = 1). I know that the mean and standard deviation aren't 0 and 1, but doing this gets your calculator to give you something called a standardised normal variable (z-value). Then you use the z-value equation in your formula booklet plus the x value and the real value of the mean to solve for the standard deviation. Hope that helps! Cheers, Mitch