ONE EIGHTH CONTEST 2025
Ghana National College - 65 points
Tema Secondary School - 33 points
Effiduase SHCS - 28 points
ONE EIGHTH CONTEST 2025
Mankranso SHS - 43 points
St Paul's SHS, Denu - 23 points
Adonten SHS - 14 points
ONE EIGHTH CONTEST 2025
St. Thomas Aquinas SHS - 51 points
Tamale SHS - 37 points
O'Reilly SHS - 25 points
ROUND 2 SPEED RACE
ARITHMETIC MEAN
QUESTION
Find the arithmetic mean of 2 millimeters, 3 millimeters, 5 millimeters, 6 millimeters, 9 millimeters, and 17 millimeters.
SOLUTION
$Arithmetic\ Mean=\frac{(2 + 3 + 5 + 6 + 9 + 17)}{6}$
$=\frac{42}{6}$
$=7\ millimeters$
PRACTICE QUESTIONS
1. Find the arithmetic mean of 4 millimeters, 6 millimeters, 9 millimeters, 13 millimeters, 18 millimeters.
ANSWER: 10 millimeters
SOLUTION
$\text{Mean}=\dfrac{4+6+9+13+18}{5}$
$=\dfrac{50}{5}$
$=10\ \text{millimeters}$
2. Find the arithmetic mean of 1.5 centimeters, 2.5 centimeters, 3.5 centimeters, 4.5 centimeters.
ANSWER: 3 centimeters
SOLUTION
$\text{Mean}=\dfrac{1.5+2.5+3.5+4.5}{4}$
$=\dfrac{12}{4}$
$=3\ \text{centimeters}$
3. Find the arithmetic mean of 12 grams, 15 grams, 18 grams, 20 grams, 25 grams, 30 grams.
ANSWER: 20 grams
SOLUTION
$\text{Mean}=\dfrac{12+15+18+20+25+30}{6}$
$=\dfrac{120}{6}$
$=20\ \text{grams}$
4. Find the arithmetic mean of 7 seconds, 9 seconds, 11 seconds, 13 seconds, 15 seconds, 17 seconds, 19 seconds.
ANSWER: 13 seconds
SOLUTION
$\text{Mean}=\dfrac{7+9+11+13+15+17+19}{7}$
$=\dfrac{91}{7}$
$=13\ \text{seconds}$
5. Find the arithmetic mean of 8 grams, 12 grams, 16 grams, 20 grams, 24 grams.
ANSWER: 16 grams
SOLUTION
$\text{Mean}=\dfrac{8+12+16+20+24}{5}$
$=\dfrac{80}{5}$
$=16\ \text{grams}$
6. Find the arithmetic mean of 2.5 metres, 3.5 metres, 4.5 metres, 5.5 metres, 6.5 metres.
ANSWER: 4.5 metres
SOLUTION
$\text{Mean}=\dfrac{2.5+3.5+4.5+5.5+6.5}{5}$
$=\dfrac{22.5}{5}$
$=4.5\ \text{metres}$