Linear Interpolation

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12-Nov-09
Linear Interpolation
Find the class that contains the median 70 2
35 ? (34 36)


All grouped data is treated as continuous data so
you do not have to round up or take mid values
(page 20)
m 34.3
2
Find the median ? 12 2 6 ? Between 6th and
7th values ? 11 Find LQ ? 12 4 3 ? Between
3rd and 4th values ? 8.5 Find UQ ? 12 4 x 3 9
? Between 9th and 10th values ? 14
Find the median ? 13 2 6.5 ? 7th value ?
12 Find LQ ? 13 4 3.25 ? 4th values ? 9 Find
UQ ? 13 4 x 3 9.75 ? 10th value ? 15
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• S1 Revision
• You need to be able to
• 1. Draw a histogram i.e. use frequency density
  for the vertical axis
• 2, Find the mean, median and quartiles for
  discrete data and draw
• A stem and leaf diagram of this data
• A box plot that includes and identifies any
  outliers
• Comment on the skew giving a reason for your
  comment
• For grouped data
• estimate by interpolation, the median and
  quartiles
• estimate the mean
• estimate the standard deviation

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• 3. Draw a tree diagram that shows dependent
  probability and use it to find probabilities
• 4. Given three probabilities P(A) 0.2 P(B)
  0.5 and P(AB) use the multiplication and/or
  addition rules to
• Find other probabilities
• State whether or not events are mutually
  exclusive or independent