Complete the chart to find the mean, variance and standard deviation. Remember to use commas and round numbers to the nearest tenth.

X

х

X-X

(x-X)?

1.345

= -82.5 =

The mean is

2.340

= -87.5

v

The variance is

3. 400

= -27.5

The standard deviation is

4.625

197.5 =

n =

ΣΧ=

(X-X)2 = 54,225.0

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585

Triangles abc and dfg are given. find the lengths of all other sides of these triangles if: b ∠a≅∠d, ab·dg=ac·df, ac=7 cm, bc=15 cm, fg=20 cm, and df-ab=3 cm.