cours statistique eg

X Y
xii−me X yjj−me
Y

•V ariable quantitative
•V ariable qualitative
{x1, x2, x3, . . . , xn}

S={7,11,9,16,4,13,8,5,12,17,14,6,3,15,18,17,11,10,8,12,1,8,7,14,16,8,19,3,18,5}.
xi
ni
N
xiX
xiX
ni
k
X
i=1
=N.
xiX
fi
fi=ni
N×100.
k
X
i=1
fi= 1.

X
N= 15
xi
ni
fi