Question

The number of children in 25 families are recorded as 2, 2, 3, 1, 4, 2, 1, 3, 1, 3, 1, 4, 2, 3, 1, 2, 1, 3, 4, 1, 2, 1, 2, 3, 1.
Calculate mean of the data.

• A. 2
• B. 1.12
• C. 2.12
• D. 3

Answer 1

The correct option is C 2.12

No. of children	Tally marks	No. of families $f_i$	$f_i$$x_i$
1		9	9
2		7	14
3		6	18
4		3	12

$\sum f_i{x}_i$ =53
$\sum f_i$ =25
$\therefore$ Mean = $\frac{\sum f_i{x}_i}{\sum f_i}$=$\frac{53}{25}$ = 2.12