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Analyzing Student Work
HI
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on the
Sofia graphed the points 1.3,-1,0.25, and 1
number line.
+ + + + + + +
-2 -1 0 1 2
which statements about Sofia's work are true? Select
all that apply.
She graphed the points correctly.
She did not graph the points correctly.
She ordered the numbers correctly.
She did not order the numbers correctly.
Then she used the number line to order the numbers from
least to greatest
-13,0.25, 1, 1.3
She correctly ordered -15 as the least.
She correctly ordered 1.3 as the greatest.

answer: slight chance that it will happen

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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