Question

heights of women have a bell shaped distribution with a mean of 165 and a deviation of 6. Using the Cebyshev's theorem, what do we know about the percentage of women with heights that are 2 standard deviations within the mean. what are the minimum and maximum heights that are 2 standard deviations within the mean

Answer 1

just the person I was looking for

Answer 2

what 165+12 and 165-12?

Answer 3

177 and 153

Answer 4

okay well the women in the wanted range are between those heights

Answer 5

k

Answer 6

we also know that the majority of the women are between those heights

Answer 7

K...so that is my minimum and maximum? what is the percentage of the height within 2 standard deviations of 165?

Answer 8

the percent is 95 and yes that is the min and max

Answer 9

it's not 95% -- you're confusing the empirical rule for Chebyshev's inequality

Answer 10

https://en.wikipedia.org/wiki/Chebyshev's_inequality#Statement for values at least \(k\) standard deviations from the mean we have \(P(\frac1\sigma|X-\mu|\ge k)\le \frac1{k^2}\); so for values at least two standard deviations away, these can comprise at most \(1/4=25\%\) of the population. so there must be at least \(75%\) within two standard deviations of the mean