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andrew11 [14]
3 years ago
7

Salaries for teachers in a particular elementary school district are normally distributed with a mean of $49,000 and a standard

deviation of $4,500. We randomly survey ten teachers from that district. (Round your answers to the nearest dollar.)
(a) Find the 90th percentile for an individual teacher's salary.
$


(b) Find the 90th percentile for the average teacher's salary.
Mathematics
1 answer:
Dmitry_Shevchenko [17]3 years ago
4 0

Answer:

they get a lot of moohlah

Step-by-step explanation:

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Two plumbers charge different rates for service. The first plumber charges $100 per service call plus $25 per hour of service. T
Bond [772]

Answer: 2

Step-by-step explanation:

6 0
3 years ago
What is a predicate of a sentence ? like:
sesenic [268]

\color{voilet}\huge{AN}\color{yellow}\huge{S}\color{blue}\huge{W}\color{orange}\huge{ER}

The predicate is <u>(</u><u>turn</u><u> </u><u>yellow</u><u> </u><u>in</u><u> </u><u>the</u><u> </u><u>fall</u><u>)</u><u>.</u>

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Because the subject in the sentence is the leaves

8 0
3 years ago
Solve the equation: k^2+5k+13=0
mr_godi [17]

Step-by-step explanation:

k² + 5k + 13 = 0

Using the quadratic formula which is

x =  \frac{ - b \pm \sqrt{ {b}^{2} - 4ac } }{2a}  \\

From the question

a = 1 , b = 5 , c = 13

So we have

k =  \frac{ - 5 \pm \sqrt{ {5}^{2} - 4(1)(13) } }{2(1)}  \\  =  \frac{ - 5 \pm \sqrt{25 - 52} }{2}  \\  =  \frac{ - 5 \pm \sqrt{ - 27} }{2}  \:  \:  \:  \:  \:  \:  \\  =  \frac{ - 5  \pm3 \sqrt{3}  \: i}{2}  \:  \:  \:  \:  \:  \:

<u>Separate the solutions</u>

k_1 =  \frac{ - 5 + 3 \sqrt{3} \: i }{2}  \:  \:  \:  \: or \\ k_2 =  \frac{ - 5 - 3 \sqrt{3}  \: i}{2}

The equation has complex roots

<u>Separate the real and imaginary parts</u>

We have the final answer as

k_1 =  -  \frac{5}{2}  +  \frac{3 \sqrt{3} }{2}  \: i \:  \:  \:  \: or \\ k_2 =  -  \frac{5}{2}  -  \frac{3 \sqrt{3} }{2}  \: i

Hope this helps you

8 0
2 years ago
An elephant went 119 km moving 42 km/h how many hours did the journey take?
Luden [163]

Answer:

1 HR ---> 42 km

? .----> 119 km

119 * 1/42

2.833

8 0
2 years ago
Read 2 more answers
Sydney has a rectangular pool as shown in the figure. The pool is 6 feet deep throughout. mc017-1.jpg How much water is needed t
densk [106]
The amount of water that is needed to fill the pool is equal to the volume of the pool.

The pool is rectangular, with uniform depth so the volume of pool will be the product of its length , width and depth.

Thus,

Volume = 25 x 18 x 6 = 2700 ft³ 

This means, 2700 ft³ water is needed to fill the pool.
8 0
3 years ago
Read 2 more answers
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