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Harrizon [31]
2 years ago
12

Amanda earned a score of 940 on a national achievement test that was normally distributed. The mean test score was 850 with a st

andard deviation of 100
If 1000 students took the test, how many scored below Amanda? Use z table.
Mathematics
2 answers:
SVETLANKA909090 [29]2 years ago
7 0

Answer:

<h3><u>L</u><u>o</u><u>w</u><u>e</u><u>r</u><u> </u><u>t</u><u>h</u><u>a</u><u>n</u><u> </u><u>A</u><u>m</u><u>a</u><u>n</u><u>d</u><u>a</u> : 816 students.</h3>

hichkok12 [17]2 years ago
6 0

Answer:

lower than Amanda:  816 students

Step-by-step explanation:

An equivalent way in which to state this problem is:  Find the area under the standard normal curve to the left (below) 940.

Most modern calculators have built in distribution functions.

In this case I entered the single command   normalcdf(-1000,940, 850, 100)

and obtained 0.816.

In this particular situation, this means that 0.816(1000 students) scored lower than Amanda:  816 students.

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alex41 [277]
14^ 0.08t = 56.

From here, you can rewrite it as log base 14 argument 56 = 0.08t.

When you plug it in t is about 19

Answer: ≈19 years
4 0
2 years ago
(Don’t send me a link pls just answer!) First 3 people to answer get lots of points pls do it by friday!
Natali5045456 [20]

Answer:

8835.73ft^3

Step-by-step explanation:

First:

Find area of the base circle.

Diameter is 15, so radius is 7.5

Area of the base circle is 56.25pi (use formula: A=pi(r)^2 ) (also ill convert pi into decimals only later)

next find the volume of the cylinder

height is 40 so volume = 56.25pi*40 = 2250pi

next find the volume of the dome at the top.

you know the radius is 7.5

Use volume of sphere formula below :

4 /3πr^3

=1767.15

alright now add the two bolded values

1767.15+2250pi

= 8835.73

hope this helps

7 0
3 years ago
Read 2 more answers
Which of the following angles is coterminal with - 2pi/3
Over [174]

Answer:

\frac{2\pi }{3} +x=2\pi

x=2\pi -\frac{2\pi }{3}

=\frac{4\pi }{3}

OAmalOHopeO

8 0
3 years ago
1. John earns $10 per hour for any work up to 40 hours. For any time over 40 in a week, he receives 1.5 times his normal pay. Ho
yanalaym [24]

Answer:

1. 520

2. 568.125

Step-by-step explanation:

1.

10 per 40 hours + 1.5 overtime

1.5 overtime = 10(1.5) = 15

10 (40) + 15 (8)

= 400 + 120

= 520

2.

11.25 per 40 hours + 1.5 overtime

1.5 overtime = 11.25(1.5) = 16.875

11.25 (40) + 16.875 (7)

= 450 + 118.125

= 568.125

8 0
1 year ago
Area of Rectangles and Squares.<br> Please show the work, I need help
USPshnik [31]

Here, I think I can help you out:

1. 21 ÷ 3

= 7

Therefore, the length is 7cm².

2. 35 ÷ 7

= 5cm²

- And so on. Simply divide the area by the length of the side given; you can answer up to question six using this strategy.

7. All sides of a square are the same length.

7 x 7

= 49cm²

9. 2 x 3.5

= 7m²

- The formula to find the area of a square/rectangle is length x width. Just multiply the given lengths for the answers :)

7 0
2 years ago
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