ck12.org normal distribution problems: Empirical rule | Probability and Statistics | Khan Academy
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- Опубликовано: 11 сен 2024
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Using the empirical rule (or 68-95-99.7 rule) to estimate probabilities for normal distributions
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hey sorry to bother you but how did they got the 16 percent im so null at it
o--- = 1.1 kgs right? and not 1.1 gms
9.5 kg and 1.1 grams ????
for a min it was messing me up so bad cuz i always try to solve before vid
Actually stand a chance on my test tomorrow. Thanks man
It's good ... I like this method to teach .. it's understandable and simple way to recognise the topic ...
VERY HELPFUL
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This helped me so much thank you!!
What if it asked what the percentage was for it to fall in the range of 7.3kg and 10.6kg? Can you explain how to do it if it asked that range?
Very useful
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Awesome job at explaining, thanks
Okay, I understand how you would get this. But I have a problem with the same concept but I cant seem to get it!
1. The pulse rates of healthy adults are normally distributed with mean 72
and standard deviation of 5.
a) What percentage of healthy adults have a pule rate over 80? (Hint:
You may want to use Excel here.)
at the 95% mark it's 82. do I still use the same method? Is there more calculations?
Platos Advocate You only use empirical rule if the SD is a factor of the value you want to calculate for.
Hi I have a question; 1). Weights of adult women have a mean of 143 poundsd and a standard deviation of 29 pounds. Approximately what percentage of adult women have weights between 114 and 201 pounds? 2). If 350 adult women are randomely selected, approximately how many would have weights between 114 and 201 pounds?
Omg! Thank you! I finally get it!!
MANY THANKS!
Well Explained...
This is amazing! Great work!
Thanks man! thanks for sharing!!
at 06:33 you say that 68 / 2 = 32, well, its 34.
better than my maths teacher
thank YOU SO MUCH
Thanks for sharing!
Wouldn't 1 SD get you .34?
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You can not mix kg and grams like that. He kept saying the standard deviation is in grams but the math he works out must make it also in Kg like the mean value.
beautiful
Shouldn't part A be 34% not 16% since it is asking for everything less than 8.4kg. I think it should include everything on the bell curve below 8.4kg.
thank you my lord
It's actually 1.1kg.
the question is in grams or kilograms?
What if you are to find the probability between 11.2 and 9.8
What software do you use for drawing these sketches? I use Libreoffice draw and can't stand it .
I finally get it
bless you
Use the steps shown in the video, and figure it out yourself.
*MORE than one sd below the mean (LESS than one below would be 34%). Very helpful video, just a reminder you are still human.
You had a misunderstanding, The normal distribution table is considered as 1. He showed that if 1 sd is 0.68 then the rest of the area is equal to 0.32 (1-0.68=0.32). Less than area would be here 0.16 (0.32/2=0.16) and more than 1 sd would be symmetrical, which is also 0.16
What does the mean mean?
Each of the legs of the 68% region are Left=34% & Right=34%, not 32%.
68% is the body without the two legs, and 32% is the remainder. It's not the two halves of the body.
these are very low level problems i need tough problems to get good grades .
my hero
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what if the value lies within a std. dev not exactly as the point mentioned example mean=750,sd=150 and probability greater than 700...... withour using pnorm() or any z-table ...
when it gets like that in stat they use a chart
normal distributions ftw :)
I never knew baby girls were almost weightless...
Hold up... answer B looks incorrect to me. Between 7.3 & 11.7 would not make up 95% because half of 16% is 8%, and on both sides of the 68% there would be 8%, making a total of 16% being added to the 68, making the answer 84%. Please explain how I am wrong
Between two standard deviation falls to exactly 2 standard deviation so you follow the empirical rule . You only subtract and divide when you are calculating less than or above standard deviations
On c), I'm confused and wonder what I'm doing wrong. If 3 standard deviations represent 97.7% and that calculates 100 - 97.7, I'm getting 2.3 which, when divided in half (half for below the 3rd standard deviation and half for above the 3rd standard deviation) splits up into 1.15% each. Why am I not getting the same answer (.15%)? (Scratching head and biting nails!)
It’s 99.7 not 97.7