Taylor129
23.02.2021 •
Mathematics
Rande
36 La répartition de la durée des films à l'affiche
un samedi, dans un complexe cinématographique,
est représentée ci-dessous.
Effectif
5
4
3
N
de
1
et
u.
0+
80
90 100 110 120 130 140 150
Durée (en min)
n
1. Eddy affirme : «La moitié des films durent au moins
1 h et demie mais moins de 2 h. >>
A-t-il raison ? Justifier.
2.a. Réaliser un tableau en regroupant ces durées par
classes d'amplitude 20 min (80 < d < 100; ...).
b. Réaliser un histogramme pour représenter cette
nouvelle répartition.
c. Comparer ces deux histogrammes.
Solved
Show answers
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Ответ:
Step-by-step explanation:
20min(80<d<10;...).
Ответ:
y intercept is (0,-8) so:-
-8 = a(0+1.5)^2 - 12.5
-8 = 2.25a - 12.5
a = 4.5/ 2.25 = 2
so we have
y = 2 ( x +1.5)^2 - 12.5
solving for x when y = 0:-
(x + 1.5)^2 = 12.5/2 = 6.25
taking sqrt's x + 1.5 = +/- 2.5
x = -4, 1
so the x intercepts are (-4,0) and (1,0)