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3 years ago

A test had a mean of 72% and a standard deviation of 8 what is the z-score for a test score of 85?

Mathematics

1 answer:

PolarNik [594]3 years ago

3 0

Answer:

The answer to this question is within 2 stabdard deviations

Step-by-step explanation:

to get the score of 85 you got to add the deviation value to the mean whuch creates the deviation. do that multiple times and you get a multiple deviation

72+8=80+8 is 88

88 is greater than 85 so a test score of 85 is within 2 standard deviations of the mean

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2. What is the equation in slope-intercept form of the line that passes through thepoints (-4, 47) and (2, -16)?O21 979y=-2*+ 21

trapecia [35]

hello

the points given are (-4, 47) and (2, -16)

let's find the intercept of this equation

$\begin{gathered} m=\frac{y_2-y_1}{x_2-x_1} \\ x_2=2 \\ y_2=-16 \\ y_1=47 \\ x_1=-4 \end{gathered}$ $\begin{gathered} m=\frac{-16-47}{2-(-4)} \\ m=-\frac{21}{2} \\ slope=-\frac{21}{2} \end{gathered}$

now, since we know the value of the slope, we can use that in the standard equation on a straight line

the standard equation of a straight line is given as

$\begin{gathered} y=mx+c \\ m=\text{slope} \\ c=\text{intercept} \end{gathered}$

we can pick any of the points and solve for intercept

let's use (2, -16)

$\begin{gathered} x=2 \\ y=-16 \\ y=mx+c \\ m=-\frac{21}{2} \\ -16=-\frac{21}{2}(2)+c \\ -16=-21+c \\ \text{collect like terms} \\ c=-16+21 \\ c=5 \end{gathered}$

now we know the value of intercept (c) = 5 and the slope (m) = 21/2

let's use this to write equation of the straight line

$\begin{gathered} y=mx+c \\ y=-\frac{21}{2}x+5 \end{gathered}$

from the calculations above, the equation of the straight line is given as y = -21/2x + 5

8 0

1 year ago

If f(x) = -5x - 1, find the function value f(1).<br><br> f(1) =

denis23 [38]

Answer: f(1) = -6

Please mark me as Brainliest

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3 years ago

Steph needs to help her parents put a fence around their pool. They want the fence to be square and want each side to measure 6

ANTONII [103]

Answer:

14 more meters

Step-by-step explanation:

6 times square (4) = 24

24-10 = 14

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3 years ago

What is 23d=109<br> pls answer

grandymaker [24]

Answer:

what kinda... what do they give yall these days but anyways,

Step-by-step explanation:

Divide each term by

23 and simplify.

Exact Form:

d=109/23

Decimal Form:

d=4.73913043

um…

Mixed Number Form:

d=4 17/23

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3 years ago

A Leopoldo su Maestra l le pidió que calcular el perímetro de un rectángulo que tiene las medidas que se indican en el dibujo cu

guapka [62]

Answer:

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Step-by-step explanation:

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3 years ago