measures of relative standing - practice problems

# measures of relative standing - practice problems -...

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Unformatted text preview: Measures of Relative Additional problems "' M 1. The average person sends 20 text messages per day. The variance is 16. I __ J— --" can get a discount if 1 am in the 15‘” percentile in terms of text message 50 " ‘Q9 usage. How many messages per day can I sent to qualify for the discount? \«| 11.6%:K—ZO ~20: L-ougq) ><—2 =0“ka : - l Ca "-' Cr ~t C. (J 1 LI, x.‘ 73—00 “1%) _ s._4—-———-""‘—' I can get a customer loyalty award for being in the 99th percentile. l-low many C'- mgesdolneed to send" In asingle daytoqllalify? ’2 2,33 1. X~20 2.5%L‘433 “”10 C 27 A 1 ‘ L) 8 ‘-'- X h -;';: i U\ j_ g " (4c; 2. Based on the above text message data, what percentage of the cell 'phﬁe provider’ 3 customer base send between 25 and 30 messages? If they have 20,000 customers, how many are in this range? 135': £0 : \.2 § :014 can 59 — a”: , g F .s_ —‘ _‘gq "'—‘"‘_——_ﬁ ﬂ 0: u‘ <51 ‘1’!” 4 oqq How many customers send between 18 and25messages? 2 5- 2L '- Lr?’ )- 7 k“ :1 F) a2 d k”__——-.. "'1‘ e '1) q More questions using the 3. I went to a Phish concert' in Portland and was curious about the age demographics of the people near me. I asked 25 people how old they were (in years)@@ (1 got the following respouses: 121, 21,22,23, 25,,2727,2,,7303031, 31, 3,] 31, 35,,40 242, ﬁﬁtiOéQ/l 71 (0/ What is the percentile rank for the age of 42? 2: a SW at' Is the percentile mange—0M What Is the age that corresponds to the loo. percentile What Is the age that corresponds to the 90" percentile? 2.:vW"5_ '¢.1:lo-—_3 ”73 ’9‘79 -3.C03 [email protected] walruses) to (I love walruses). The average score was @vith a standard deviation 1.9 I only have room for 75 people in my class and would like 0“ to offer those slots to the people with the strongest fear of walruses (i.e., the /\ o Q’Howeﬂ scores on the scale). What score ear scale will be the / cutoff int for etti into m class? \9 p0 g ﬁg y F q o o O 0 For my first class, I have decided that I don’t actually want people who are extremely afraid of walruses because they may freak out on me. Instead I a 2 S- want people who are in the middle 50% of the population. (And I was able to , . get a larger room.) What scoreson the wakesWe co 5 o 0 q OI group? How manystuden‘fs should I ex ? ~ I z 3' -mq an “mach WW /~—— I am curious how" manypgople have relativelygeml‘feéiugs a .. {q 8 walruses. Of my 250 peothTm’W‘” y o scored between -1 and +1 on the walrus fear scale? y a O I Cl 7. ( ,. (— ‘3’ 7 5 0/0 (o o "/r, ,MXTK”‘3 4 1‘1 “’"m a ’1’ nab/.013 “339550; @737 \ \ ﬂ 3 N {31/ «N 051 ,1 X W s3 '3 ”(01:1 +3 _2.,C02( __l \oq3 2) xJ\S‘ "\.Z‘1 ,_ ,3 ,3 / ...
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