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# The numbers of passengers on 9 airline ﬂights were 22, 33,

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The numbers of passengers on 9 airline ﬂights were 22, 33, [#permalink]  30 May 2019, 10:25
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The numbers of passengers on 9 airline ﬂights were 22, 33, 21, 28, 22, 31, 44, 50, and 19. The standard deviation of these 9 numbers is approximately equal to 10.2.

(a) Find the mean, median, mode, range, and interquartile range of the 9 numbers.
(b) If each ﬂight had had 3 times as many passengers, what would have been the mean, median, mode, range, interquartile range, and standard deviation of the 9 numbers?
(c) If each ﬂight had had 2 fewer passengers, what would have been the interquartile range and standard deviation of the 9 numbers?

[Reveal] Spoiler: OA
(a) mean=30,median=28,mode=22, range=31,interquartilerange=17 (b) mean=90,median=84,mode=66, range=93,interquartilerange=51, 940standarddeviation $$= 3 \sqrt{\frac{940}{9}} \approx 30.7$$ (c) interquartilerange=17,standarddeviation $$\approx 10.2$$

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