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3. The following grouped data was derived from interviews with a sample of estate agents shows the number of building plots sold over a period of six months falling into differen class bands Class Intervals (E 10-under 1S 15 - under 20 20 under 25 25 under 30 30-under 35 35 under 45 Frequency 35 29 16 12 45 under SS a Construct an ogive showing the cumulative relative frequency of c. You are told that the mean from the original ungrouped data was found to be lower Compute the mean and median number of building plots sold than your answer in part c. Why has this occurred?
math   Statistics-And-Probability   
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claSS frequenc ess han more than 6 S-20 20-2S 116 8S 6 29 36 -3S lo8 20 122- 0 12 2- b we calculate median where, ower limit of median class N=Tokl frequency cf= cumulative trequency dess than type) of the elass Preceding median class h = width of median class ffreq uency oF median class Here , N=.122 .. N 122 2. The Cumulalive frequency which is just greton than ,61 is 63 . The median ClasS s 2o-25-Here, 3S 2 median 24 7143 Thus median Then we find ou! mean clasS freqvenc mi interv fi class Cxi 10 -Is- S20 20 -2S S-30 30-3S 3S-4S 12 S 17-S 22 S 27、S 32 S 7S 38S 787.S :2 2 8S S 2o 448O 10 O 12- 2 So Σもi 14S 25,7more than OGiue Less tha) Ho TOS 5 class interva medion -24.7

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