Find the broken quartile formula

Exercise and reference answers

Questions

1. Statement parts

   1. Q1
   2. =
   3. L
   4. +
   5. ((N/4
   6. +
   7. nb)/nw)
   8. x
   9. c

   Correction

   minus — the count below the class is subtracted, never added

   Incorrect part

   +

2. Statement parts

   1. P90
   2. =
   3. L
   4. +
   5. ((90N/100
   6. +
   7. nb)/nw)
   8. x
   9. c

   Correction

   minus — adding nb pushes the percentile past the class

   Incorrect part

   +

3. Statement parts

   1. Q1
   2. =
   3. L
   4. +
   5. ((N/2
   6. -
   7. nb)/nw)
   8. x
   9. c

   Correction

   N/4 — N/2 is the median, not the first quartile

   Incorrect part

   ((N/2

Instructions

One token in each line is wrong. Tap it, then read the correction.