29. During a second Term Examination,
a boy scored the following marks:
Arithmetic 89%, English 60%,
Yoruba 80%, General Paper 96% and
Social Studies 85%. What was his
average mark?
(a) 70%
Answers
Answer:
answer is 82..........
Answer:
82%
Step-by-step explanation:
Head onto the last paragraph if you don't need too brief explanation and clarification. It's underlined and big.
Average means the central value between sets of data
if he had two grades:
0% and 100%
his average is 50%
...
A percent means over a hundred
so if a grade is 50%
it's in other words
or also in decimals: 0.5
...
if he had 3 grades:
30%, 60%, 90%
his average is 60%
...
To find an average value of too many sums
use this:
AVG=
...
why is this?
well
to the first example, we had two grades.
0 and 100
the sum is = 0%+100%
= 100%
number of..= 2
AVG = 100%/2
= 50%
...
to the second example,
sum = 30% + 60% + 90%
= 180%
number= 3
AVG = 180%/3
= 60%
...
As you can see.
The grades was added so that every single data came into account in the sum
The sum was divided by the number of datas so that all datas are taken into account also
the average divided the entire sum by the entire number of grades to give a middle answer to all datas that was taken into account..
...
LAST PARAGRAPH
... Heading on to the question you gave
Use the formula (clarified up) :
AVG=
So:
Sum= 89% + 60% + 80% + 96% + 85%
= 410%
number of..= 5
AVG= 410%/5
=82%
....
Hope you get everything now!