# Tally

## Tally

When counting the values of a statistical variable, the number of values that corresponds to a given characteristic or that belongs to a particular class of values.

(A) If the attribute studied is discrete, the tally of a value x of this characteristic is the number of individuals for which the value of the characteristic is x.

### Example

DISTRIBUTION IN A CLASS OF 40 STUDENTS

 Boys Girls TOTAL Wears glasses 13 8 21 Do not wear glasses 9 10 19 TOTAL 22 18 40

Total tally: 40 students
Partial tally of boys: 22 students
Partial tally of girls: 18 students
Partial tally of students who wear glasses: 21 students
Partial tally of girls who wear glasses: 8 students

(B) If the characteristic studied is continuous, the tally of a class C is the number n of individuals for which the value of the characteristic belongs to the class C.

### Example

DISTRIBUTION IN A CLASS OF 40 STUDENTS

 Height (cm)/ Mass(kg) [120, 130) [130, 140) [140, 150) [150, 160) [160, 170) TOTAL [45, 55) 6 4 3 0 1 14 [55, 65) 4 3 5 2 0 14 [65, 75) 2 2 5 1 2 12 TOTAL 12 9 13 3 3 40

Total tally: 40 students
Partial tally of the group of students whose mass is located in the interval [140, 150) is 13 students
Partial tally of the group of students whose height is located in the interval [65, 75) is 12 students
The partial tally of the group of students whose mass belongs in the interval [140, 150) and whose height belongs to the interval [65, 75) is 5 students