Need help with Chebyshev application in Example 13 Question #2

[Enlighten_me]

I would appreciate it if someone could explain to me how to answer example 13 question #2 of reading 7
And for the test, do we need to memorize table 23(k, its interval around the sample mean, and proportion) of reading 7?

 

[hei.so]

Can you rewrite the question for those who don’t have the book?

 

[S2000magician]

Chebyshev’s inequality gives the minimum percentage of observations that lie within a given (symmetric) interval about the mean. In Part 1 you created an interval that contains at least 75% of the observations, so at least 75% of the observations, or 783 (= 1,044 × 0.75) are in that interval. Chebyshev’s inequality doesn’t give a maximum percentage in the interval, so that maximum is 1,044 (i.e., all of them).
The rest of the answer uses data that weren’t given in the question. Not really cricket.

 

[Enlighten_me]

@hei.so
S2000magician answered my question before I got to reply. Thanks for trying.
@S2000magician
Got it. Thanks for the help

 

[S2000magician]

My pleasure.