The 1st and 3rd choices are irrational. The other 2 are rational. Irrational numbers are numbers that you can't make a simple fraction out of.

**Answer:**

Midpoint = (4,4.5) or written as fraction (4,)

**Step-by-step explanation:**

**Answer:**

**Step-by-step explanation:**

Calculating the z scores for each student:

zTara = (52-64 )/8 = -12/8 = **-1.5**

zJamal = (82-64)/8 = 18/8 =** 2.25**

zSamuel = (66-64)/8 = 2/8 = **0.25**

From the z score table, the probability of Tara's score being greater than -1.5 is 0.0668. Therefore, the percentage is 0.0668*100 = 6.68% which means that around 7% of the students got a better mark than Tara, with **93.32%** of the students scoring lower than her.

The probability of Jamal's score being greater than 2.25 is 0.0122, therefore the percentage is 0.0122*100 =** 1.22%** implying that around 1% of the students got a better mark than Jamal.

The probability of Samuel's score being greater than 0.25 is 0.4013, therefore the percentage is 0.4013*100 = 40.13% which means that around 40% of the students got a better mark than Samuel, with **59.87%** of the students scoring lower than him.