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Brut [27]
3 years ago
9

The salary of teachers in a particular school district is normally distributed with a mean of $50,000 and a standard deviation o

f $2,500. Due to budget limitations, it has been decided that the teachers who are in the top 2.5% of the salaries would not get a raise. What is the salary level that divides the teacher's into one group that gets a raise and one that doesn't?
Mathematics
1 answer:
Westkost [7]3 years ago
3 0

Answer:

54,900

hope this helps!!

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Twice the sum of a number, n, and seven is four less than the quotient of a number, n, and three.
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Step-by-step explanation:

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Water is leaking out of an inverted conical tank at a rate of at the same time that water is being pumped into the tank at a con
Alexus [3.1K]

Water is leaking out of an inverted conical tank at a rate of 10,500 cm3/min at the same time that water is being pumped into the tank at a constant rate. The tank has height 6 m and the diameter at the top is 4 m. If the water level is rising at a rate of 20 cm/min when the height of the water is 2 m, find the rate at which water is being pumped into the tank

<h3><u>Answer:</u></h3>

The rate at which water is being pumped into the tank is 289,752 cm^3/min

<h3><u>Solution:</u></h3>

According to question,

There is an inverted conical tank, through which water is leaking at a rate of 10,500 cm3/min at the same time that water is being pumped into the tank at a constant rate

<em><u>The dimension of tank are: </u></em>

Diameter = 4cm

Radius(r) = \frac{diameter}{2} = 2cm

Height = 6cm

Clearly we can see that height is 3 times radius so, we can write

h = 3r OR r = h/3    ……………………. (1)

<em><u>The volume of cone "V" is given as:</u></em>

\text { volume of cone }(\mathrm{V})=\frac{1}{3} \pi r^{2} h   -------- (2)

From (1) and (2)

\text { Volume of cone(V) }=\frac{1}{3} \pi\left(\frac{h}{3}\right)^{2} h

\mathrm{V}=\frac{\pi h^{3}}{27}   -------- (3)

<em><u>Now we calculate the derivate:-  </u></em>

\frac{d V}{d t}=\frac{3 \pi h^{2}}{27} \frac{d h}{d t}

\frac{d V}{d t}=\frac{\pi h^{2}}{9} \frac{d h}{d t}  --------- (4)

According to question, when height is 2m = 200cm, the water level is rising at a rate of 20 cm/min

\frac{d h}{d t}=20 \mathrm{cm} / \mathrm{min}

On putting above values in equation(4) and solving we get

\frac{d V}{d t}=279252

Hence, the rate at which water is being pumped is 289,752 cm^3/min which is the sum of water volume increasing at rate of 279,252 and 10,500 leaking out

3 0
3 years ago
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