JAMB - Mathematics (1981 - No. 11)
Marks scored by some children in an arithmetic test are:5, 3, 6, 9, 4, 7, 8, 6, 2, 7, 8, 4, 5, 2, 1, 0, 6, 9, 0, 8.
The arithmetic mean of the marks is
The arithmetic mean of the marks is
6
5
8
7
10
Vysvětlení
Add all the No.s together to give 100
\(\sum\)xf = 100
N = 20
x = \(\frac{\sum xf}{N}\)
= \(\frac{100}{20}\)
= 5
\(\sum\)xf = 100
N = 20
x = \(\frac{\sum xf}{N}\)
= \(\frac{100}{20}\)
= 5