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iGreen
 one year ago
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iGreen
 one year ago
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iGreen
 one year ago
Best ResponseYou've already chosen the best response.0What are the expected number of flights on time?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.2Since 84% of the flights in the random sample are on time, we expect the same percentage to be on time in general. 84% means 84 out of 100.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.2\(\dfrac{84}{100} = \dfrac{x}{203} \)

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.1Your fav igreen! XD

iGreen
 one year ago
Best ResponseYou've already chosen the best response.0I came up with .84 * 203 or 170.52

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.1That sounds right

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.2You can think of the proportion as follows: 84 flights out of 100 are on time just like x flights out of 203 are on time.

iGreen
 one year ago
Best ResponseYou've already chosen the best response.0I was trying to say that before anyone else commented..for some reason I can only make one comment and it glitches and I have to reload..

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.2Correct. I'd round it off to 171 because I don't know what 0.52 of a flight is.

iGreen
 one year ago
Best ResponseYou've already chosen the best response.0Okay, now it asks: "What is the standard deviation?"

iGreen
 one year ago
Best ResponseYou've already chosen the best response.0Any idea on how to find that? @mathstudent55

iGreen
 one year ago
Best ResponseYou've already chosen the best response.0What about you? @Astrophysics

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.1Standard deviation is the average difference between any point of data and the mean, been a long time since I did statistics but I'm sure we can figure it out. \[\sigma = \sqrt{\frac{ 1 }{ N }\sum_{i=1}^{N}(x_i\mu)^2}\]

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.1But for this the easiest way I see is we can just use \[\sigma = \sqrt{npq}\] where \[\mu = \sqrt{np}\] that should be easy enough :P

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.1That sounds good!

iGreen
 one year ago
Best ResponseYou've already chosen the best response.0\(\sf \sqrt{260 \times 0.84 \times 0.16}\)
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