If xi, and fi, are sufficiently small
, then which method is an appropriate choice?
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If xi and fi are sufficiently small, then the direct method is an appropriate choice. If xi and fi are numerically large numbers, then we can go for the assumed mean method or step-deviation method.
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If xi and fi are sufficiently small, the direct method will work.
Explanation:
- xi is for observation and fi for frequency
- Direct method ⇒ x = Σ xi fi / fe
- where fe is sum of frequency
- There are three methods for finding the mean from a grouped frequency table.
1- Direct method.
2- Assumed Mean method.
3- Step Deviation method.
- In direct method the calculus of variations is a general method for constructing a proof of the existence of a minimizer for a given functional .
Answer = Direct Method
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