**T-Scores**

• T-scores are ‘Transformed Scores’ used to standardise raw scores across the level or cohort.

• T-scores give the relative rank or position of a pupil’s performance compared to all the other pupils in that subject in the same exam.

• T-scores can be computed for individual subjects and then summed up as a single aggregate T-score, say in the case of PSLE.

• T-scores allow pupils to be ranked fairly.

**How are T-Scores calculated in PSLE?**

• As mentioned, T-score is the transformed or adjusted score a student will get for a subject, after factoring in the level or cohort’s mean and SD for that subject.

• Formula for T-Score

**X** = Raw score of student in the subject

**Y** = Average or Mean Score of the level or cohort

**Z** = Standard Deviation (SD) of the level or cohort Standard Deviation (SD) is the spread of the marks around the average.

**Why Standard Deviation (SD) matters?**

• Here is an example to illustrate that with the same mean, SD

or the spread of marks can vary.

**• Example 1 –**

Allan, Bernard and Charles have $45, $50 and $55 respectively. They have an average of $50 each.

**Example 2 –**

Dan, Edward and Frank have $10, $50 and $90 respectively. They also have an average of $50 each.

**• In Example 1,** the spread (from $45 and $55 to average of

$50) is smaller than the spread

**• in Example 2** (from $10 and $90 to average of $50)

**• Conclusion:** Despite having the same mean, Example 1’s data have a smaller SD or “spread from the mean” as compared to that of Example 2

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## What if my son score this. How would his results be calculated?EL 75CH 65Math 90Sc 90

What if my son score this. How would his results be calculated?

EL 75

CH 65

Math 90

Sc 90

## Is English & Chinese PSLE result taken 100% and only 50% each for Math & Sc?

Is English & Chinese PSLE result taken 100% and only 50% each for Math & Sc?