Umi's test grades for this semester are in the list shown. The mean of her test grades is 82.4. 86, 93, 90, 85, 42, 91, 90
If the lowest test grade is eliminated, which statement about the new mean is true?
A. The new mean will be lower by about 40.

B. The new mean will be lower by about 7.
C. The new mean will stay about the same.
D. The new mean will be higher by about 7.
E. The new mean will be higher by about 40.

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Ответ:

richhgirlex

22.05.2022

Mathematics

The formula of a distance between two points:

$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

$A(-2,\ 2);\ B(5,\ -3)\\\\AB=\sqrt{(5-(-2))^2+(-3-2)^2}=\sqrt{49+25}=\sqrt{74}\\\\A(-2,\ 2);\ C(-4,\ -1)\\\\AC=\sqrt{(-4-(-2))^2+(-1-2)^2}=\sqrt{4+9}=\sqrt{13}\\\\B(5,\ -3);\ C(-4,\ -1)\\BC=\sqrt{(-4-5)^2+(-1-(-3))^2}=\sqrt{81+4}=\sqrt{85}\\\\P_{\triangle ABC}=\sqrt{74}+\sqrt{13}+\sqrt{85}$

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