To compute the mean score in science classes from the available tables, which function combination will produce the result?

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Multiple Choice

To compute the mean score in science classes from the available tables, which function combination will produce the result?

To get the average score for science classes, you first filter the data to include only science rows, then apply an average to the score values. The WHERE clause handles the filtering, and the AVERAGE (AVG) function computes the mean across the filtered rows. In practice, you’d write something like SELECT AVG(score) FROM your_table WHERE subject = 'Science'; This combination is the only one that both narrows the dataset to the science subset and calculates its mean. The other options wouldn’t yield the desired result: counting with GROUP would give counts (and possibly per group) rather than a single mean; summing with GROUP would provide sums, not a mean; concatenating is for text and doesn’t perform numeric averaging.

To get the average score for science classes, you first filter the data to include only science rows, then apply an average to the score values. The WHERE clause handles the filtering, and the AVERAGE (AVG) function computes the mean across the filtered rows. In practice, you’d write something like SELECT AVG(score) FROM your_table WHERE subject = 'Science'; This combination is the only one that both narrows the dataset to the science subset and calculates its mean.

The other options wouldn’t yield the desired result: counting with GROUP would give counts (and possibly per group) rather than a single mean; summing with GROUP would provide sums, not a mean; concatenating is for text and doesn’t perform numeric averaging.

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