di is the deviation of xi from assumed mean a.

If mean = x + ∑fidi /∑fi, then x is

  1. class size
  2. number of observation
  3. assumed mean
  4. none of these

mean= a + ∑fidi/ ∑fi  where,

a is assumed mean

di=xi-a

  • 4
x is the class size
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Lahari
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Jejwje
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