Question

The following grades are awarded to the students based on the table shown below. Check the stem-leaf plot and choose the correct statement.

$\text{Grade}$	$\text{Marks}$
$\text{A+}$ $\text{A}$ $\text{A-}$ $\text{B}$ $\text{C}$	$\text{9.0 - 10}$ $\text{8.0 - 9.0}$ $\text{7.0 - 8.0}$ $\text{6.0 - 7.0}$ $\text{5.0 - 6.0}$

$\text{Stem}$	$\text{Leaf}$
$\text{5}$ $\text{6}$ $\text{7}$ $\text{8}$ $\text{9}$	$\text{0 3 6 8 9}$ $\text{2 4 6 6 6}$ $\text{5 7 4}$ $\text{0}$ $\text{5 7 8 9}$

Key: 9|5 = 9.5 marks

• A. Seven students received grade $A-.$
• B. Five students have received grade $A+.$
• C. None of the students have received grade $A.$
• D. Nine students have received grades $A-$ and $B.$

Answer 1

The correct option is D Nine students have received grades $A-$ and $B.$

Let’s check the options one by one.

Option A: Students whose marks are between 9.0 and 10 will receive the grade $A+$. If we check the last row of the stem, we can see four scores: 95, 97, 98, and 99. This means $\text{four}$ students have scored A+. Hence, option A is incorrect.

Option B: Students whose marks are between 7.0 and 8.0 will receive the grade A-, and the students whose marks are between 6.0 and 7.0 will receive grade B. If we check the second and third rows of the stem, we can see $\text{nine}$ scores: 62, 64, 66, 66, 66, 73, 74, and 74. Hence, option B is correct.

Option C: If we check the fourth row of the stem, one student has scored 80 marks. Hence, option C is incorrect.

Option D: The third row of the stem shows that three students have scored marks between 7.0 and 8.0. Hence, option D is incorrect.