a) \( \frac{\sum_{i=1}^m n_i \bar{x_i}}{\sum_{i=1}^n n_i}\)
b) \( \frac{\sum_{i=1}^n n_i \bar{x_i}}{\sum_{i=1}^m n_i}\)
c) \( \frac{\sum_{i=1}^n n_i \bar{x_i}}{\sum_{i=1}^n n_i}\)
d) \( \frac{\sum_{i=1}^m n_i \bar{x_i}}{\sum_{i=1}^m n_i}\)
When the sample size is variable, which one of these can be used to evaluate the value of x double bar?
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answerhappygod
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When the sample size is variable, which one of these can be used to evaluate the value of x double bar?
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