The stem-and-leaf diagram below shows the times, in minutes, taken by a group of students in a schoo

Question

The stem-and-leaf diagram below shows the times, in minutes, taken by a group of students in a school to assemble a toy car for a charity event.

Stem	Leaves
$1$	$0\quad 2\quad 4\quad 5\quad 5\quad 8\quad 8\quad 9$
$2$	$1\quad 1\quad 3\quad 3\quad 4\quad 5\quad 6\quad 6\quad 6\quad 7\quad 7\quad 8\quad 9$
$3$	$0\quad 0\quad 0\quad 1\quad 1\quad 3\quad 7$

Key: 2|0 represents 20 minutes.

Find the time taken by the slowest student to assemble a toy car.[1]
25% of the students took less than $p$ minutes to assemble a toy car. Find the value of $p$.[1]

Accepted Answer

(a) $37\text{ min}$ (b) $p=19\text{ min}$

Stem	Leaves
\(1\)	\(0\quad 2\quad 4\quad 5\quad 5\quad 8\quad 8\quad 9\)
\(2\)	\(1\quad 1\quad 3\quad 3\quad 4\quad 5\quad 6\quad 6\quad 6\quad 7\quad 7\quad 8\quad 9\)
\(3\)	\(0\quad 0\quad 0\quad 1\quad 1\quad 3\quad 7\)

2025 GESS PRELIMS P1 Q4