Graph the line with slope - 1/3 and y-intercept -7.

Step-by-step explanation:

The slope-intercept form of an equation of a line:

m - slope

b - y-intercept (0, b)

We have

Substitute:

We only need two points to draw a line.

One we have: y-intercept → (0, -7).

Calculate other point:

Substitute x = -3 to the equation of a line:

Mark the points on the coordinate plane and draw a line through the given points.

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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