Ex 2: Normal Distribution - Use the Empirical Rule
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- Опубликовано: 21 авг 2024
- Use the empirical rule or the 68-95-99.7 rule to determine what percent of data falls between two data values and determine data for which a certain percent of data will fall between.
mathispower4u.com
I normally find these videos helpful, but he doesnt break the problem down enough in this video.
What percentages of widget weights lie between 47 and 59 ounces?
It seems like hes subtracting the mean 55-N=47 so n=8 (55-8=47). Since the standard deviation is 4 and 2(4) = 8. I guess thats where he got 47=55-2(4) so its -2 below the mean. Then after that he does 59-n=55. N=4 (59-4=55). and since the standard deviation is 4 and 1(4)=4 he gets 59=55+1(4). so this is where he gets +1 above the mean. he then uses the chart and adds 13.5+34+34= 81.5
I'm so confused where did we get the 8 from?
That's what im saying!!!!! Where did the 8 come from???
@@The_Breadman
OK where did the 8 come from to subtract 55?
is there not a standard consensus on standard deviation percentages on a bell curve? i thought it was 34.1% 13.65% and 2.1%.... ugh that is so frustrating....