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mojhsa [17]
4 years ago
5

The time it takes to complete a test is

Mathematics
1 answer:
astra-53 [7]4 years ago
8 0

Answer:

<h2>The z-score is -3.08, approximately.</h2>

Step-by-step explanation:

The z-score is defined

Z=\frac{x - \mu}{\sigma}

Where \mu is the mean, \sigma is the standard deviation and x the data value.

In this case, we have

x=8\\\mu = 45\\\sigma=12

Replacing values, we have

Z=\frac{8-45}{12}=\frac{-37}{12} \approx -3.08

Therefore, the z-score is -3.08, approximately.

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A student rounds a number to 12.9. Which of the following is a possible value of the original number?
LekaFEV [45]

Answer:

12.85, 12.86, 12.87, 12.88, 12.89, 12.90, 12.91, 12.92, 12.93, and 12.94

Step-by-step explanation:

there is none

3 0
3 years ago
A school bus drove at a velocity of 23.04 km/m for 18 min. What distance sis the bus drive
Sphinxa [80]

Answer:

414.72 km

Step-by-step explanation:

formula:  velocity= distance traveled by the time or v= d/t

velocity: 23.04 km/m

time: 18 min

distance: x

you have to change the formula a little bit

distance= velocity times time or d=v times t

23.04 times 18= 414.72

6 0
4 years ago
Read 2 more answers
What equation is the inverse of y=2x^2-8?
Fynjy0 [20]

Step-by-step explanation:

To get the inverse, swap the x- and y-variables, then solve for y. We should have the equation: x = 2y^2 - 8

Solving for y:    

y = 2x^{2} - 8    because  y + 8 = 2x^{2} or  x =\sqrt\frac{y +  8}{2}

So on interchanging the variable, we get the equation:

x = 2y^2 - 8

x + 8 = 2y^2

y = \sqrt\frac{x + 8}{2}

5 0
3 years ago
In circle V, r = 14ft.
Bad White [126]

For this case we have that by definition, the area of a circle is given by:

A = \pi * r ^ 2

Where:

r: It is the radius of the circle

According to the data of the statement we have that the circle has a radius of 14 \ ft

Substituting in the formula we have:

A = \pi * (14) ^ 2\\A = \pi * 196\\A = 196 \pi

So, the area of the circle is 196 \pi feet squared

Answer:

Option D

7 0
3 years ago
Read 2 more answers
Mindy bought10 grapefruits at the rate of $6.00 per dozen. How much did she pay for the fruit?
TiliK225 [7]

Answer 5

Step-by-step explanation:

6/12=.5

.5*10=5

7 0
3 years ago
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