A student consistently makes errors when calculating mean. When asked to find the mean of 12, 6, 4, 7, 9, 6, for example, the student adds all of the numbers together and divides the sum by 5. How would the teacher remediate this pattern of errors?
What will be an ideal response?
The student appears to have divided the sum of the set by the incorrect number. The teacher would remind the student to divide the sum of all of the values in the data set by the number of values in the data set, even when two values are repeated. The teacher would provide additional examples of data sets, some with repeating values, to determine if the remediation was effective.
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