Finding z-score for a percentile | AP Statistics | Khan Academy

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Example finding the minimum z-score and numerical threshold to be in a given percentile in a normal distribution.
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[@davidhu8069]

I just want to say thank you so much!!!! I was cramming before a statistics test and this video cleared up everything I had a doubt on! Thank you! :)

[@sergiosandoval5772]

Thanks for the explanation. Really helped me understand the concept. But just one observation, wouldn't it be closer to 70% to use 0.52 vs. 0.53 z score? Since 0.0015 is closer to 70% than 0.0019 (looking at the last two digits of the z score and zeroing out the preceding digits)

[@flagshipbuilds]

Thank you Khan Academy. This helped out a lot!

[@lethabopearlpheeha8917]

You are such a star😩😩

[@saravazquez4706]

I still don't get it and I have test in 2 hours. I'm dead.

[@kambabeng]

Hello,hope you passed the test

[@csabs163]

I also hope you passed

[@pndsantoshdoddi709]

First time viewers also easily understand the concept..........
Thank you

[@nse7332]

Life saver thank you so much

[@adansultan9815]

Thank god for you guys

[@haziehigh3694]

Thank you so much

[@goatmodegaming]

I put the data (0.3, 80, 9, right) into invnorm on my calculator and got 84.7, then used the Z score formula for 0.5222

[@NathanMargolis1]

Hello,
I know this is an old video. But there is a correction that should be made. 0.52 is the ACTUAL z-score, not 0.53. It doesn't matter if it is below 70%, so long as it is closer than the other value (in this case .7019).

[@carlosmartinez-qr2ot]

Thank you soooo much

[@mandykidwell-parkin655]

I don't get it, my question is: Assume the random variable X is normally distributed with mean 50 and standard deviation 7. Find the 96 th percentile. I have no z-score grid either. I am so lost.

[@japhethbonnema]

this guy playing csgo with that crosshiar?

[@aviisgoated6178]

nice video.

[@ragnarrok3349]

Great if you have that table. Useless otherwise

[@abitofeverythingbynastassi6273]

Yeah. Thumbs down because I learned nothing . What does the .50 have to do with anything? you made no connection as to how to find that portion. Annoyed. Thanks anyway

[@zgb3l]

my resting heartbeat is 96 ._. I don't have school nurses tho. help.

[@PureSkySprinkles]

I don't understand why 30% is on the right side instead of the left side.... 30 is less than 80 so shouldn't it be on the left side making it a negative?

[@ethankaledp8174]

Deez nuts