Question

3. Matt and Ann, in different statistics classes, were given the same exam. the exam results are in the table below.

Mean Grade Stdev.

Matt's Class - 70 5

Ann's Class - 80 10

If Matt scored an 80 on his exam and Ann scored an 85 on her exam, which student performed better to their class? write a sentence that justifies your answer.

4. The z-Score of a student's test grade is -1.35. if the mean is 70, which of the following could be the value of the student's grade:

A) 70 B) 85 C)63 D) cannot be estimated

Answer 1

3. For Matt's class:

If Matt score 80 on his exam then his z-score =

For Ann's class:

If Ann score 85 on his exam then his z-score =

As the z score for Ann is less. which means it is closer to the mean than Matt score.

So Ann performed better to their class.

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4. z = -1.35, mean =70

As the standard deviation is not given so we cannot calculate the student score.

Answer: D cannot be determined.