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evablogger [386]
2 years ago
9

Denis examined the records of the clients who had joined his gym more than six months ago, and he found these statistics: \begin

{aligned} &P(\text{joined in January})=0.12 \\\\ &P(\text{member for over 6 months})=0.5 \\\\ &P(\text{over 6 months and January})=0.024 \end{aligned} ​ P(joined in January)=0.12 P(member for over 6 months)=0.5 P(over 6 months and January)=0.024 ​ Find the probability that a client remained a member for more than 666 months, given that the client joined in January.
Mathematics
1 answer:
drek231 [11]2 years ago
8 0

Answer:

.2

Step-by-step explanation:

This is a conditional probability question. So it's asking you to find the probability that a client remained a member for more than 6 months, given that the client joined in January - which is formatted as P = (.5 | .12). You would then divide the chance of being over 6 months AND in January over the chance of being a member for over six months. ( .024 / .12) There, you would get .2 as your answer.

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What are the zeros of the quadratic function f(x) = 6x^2 + 12x – 7?
strojnjashka [21]

Answer:

x1=\frac{-2+\sqrt{26/3}}{2}

x2=\frac{-2-\sqrt{26/3} }{2}

Step-by-step explanation:

To find the zeros of the quadratic function f(x)=6x^2 + 12x – 7 we need to factorize the polynomial.

To do so, we need to use the quadratic formula, which states that the solution to any equation of the form ax^2 + bx + c = 0 is:

x=\frac{-b±\sqrt{b^{2}-4ac}}{2a}

So, the first thing we're going to do is divide the whole function by 6:

6x^2 + 12x – 7 = 0 -> x^2 + 2x - 7/6

This step is optional, but it makes things quite easier.

Then we using the quadratic formula, where:

a=1, b= 2, c = -7/6.

Then:

x=\frac{-2±\sqrt{2^{2}-4(1)(-7/6)}}{2}

x=\frac{-2±\sqrt{4 +14/3}}{2}

x=\frac{-2±\sqrt{26/3}}{2}

So the zeros are:

x1=\frac{-2+\sqrt{26/3}}{2}

x2=\frac{-2-\sqrt{26/3}}{2}

4 0
2 years ago
11. In a certain town the ratio of the number of cars to that of taxis is 15:4. If
Bess [88]

Answer: 645 cars

Step-by-step explanation:

Divide 172 by 4 to find the multiple which is 43 so if 4 was multiplied by 43 to get 172 taxis you must multiply 15 by 43 which gives 645

4 0
2 years ago
Read 2 more answers
The inequality describes the range of monthly average temperatures T in degrees Fahrenheit at a certain location. Find an equiva
kolezko [41]

Answer:

Now if the high and low monthly average temperatures satisfy the inequality, then the , monthly averages are always within 22 degrees of 43°F.

Step-by-step explanation:

The inequality describes the range of monthly average temperatures T in degrees Fahrenheit at a certain location.

The inequality expression is given as:

|T-43|\leq 22

now this expression could also be expressed as:

-22\leq T-43\leq22\\\\-22+43 \leq T \leq 22+43\\\\21\leq T\leq 65

Now if the high and low monthly average temperatures satisfy the inequality, then the , monthly averages are always within 22 degrees of 43°F.

( As the difference is 22 degrees to the left and right)

5 0
2 years ago
A local community center built a rectangular basketball court using 100 feet of fence. They used part of one side of the buildin
Rashid [163]

Answer:

Maximum Area of the basketball court = 1250 ft²

Maximum area of the playground = 400 ft²

The basketball is 3.125 times larger than than the playground.

Step-by-step explanation:

The diagram representing the description is attached to this solution.

The big rectangle represents the basketball court.

The small rectangle represents the playground.

Let the length and width of the basketball court be y and x respectively.

The length and width of the small playground will be (y-30) and (x-5) respectively

The Area of the basketball court is

A(x, y) = xy

But, 2x + y = 100

We can maximize the Area by turning the two variable function into a one variable function and substituting for y in the Area equation.

2x + y = 100

y = 100 - 2x

A(x, y) = xy

A(x) = x(100 - 2x) = 100x - 2x²

A(x) = 100x - 2x²

At maximum point, (dA/dx) = 0 and (d²A/dx²) < 0, that is, negative.

(dA/dx) = 100 - 4x = 0

(d²A/dx²) = -4 < 0

Hence, it's a maximum point.

At maximum point,

(dA/dx) = 100 - 4x = 0

100 - 4x = 0

4x = 100

x = 25 ft

y = 100 - 2x = 100 - 2(25) = 100 - 50 = 50 ft

Hence, the length and width of the basketball court that maximizes the Area are 50 ft and 25 ft respectively.

For the small playground,

The length = (y - 30) = (50 - 30) = 20 ft

The width = (x - 5) = (25 - 5) = 20 ft

Maximum Area of the basketball court = xy = (50)(25) = 1250 ft²

Maximum area of the playground = (y-30)(x-5) = (20)(20) = 400 ft²

Ratio of the Areas = (1250/400) = 3.125

The basketball is 3.125 times larger than than the playground

Hope this Helps!!!

6 0
2 years ago
Helps pls HELPPPPPPP
Brrunno [24]

Answer: Third option.

Step-by-step explanation:

Let be "x" the approximate actual width  (in feet) of the car.

Based on the information provided in the exercise, you know that the scale of the model car is this one:

1:32

Which can be written as a fraction:

\frac{1}{32}

Therefore, if you know that the width of the model car is 2.3 inches, you can set up the following proportion:

\frac{1}{32}=\frac{2.3}{x}

Finally, you must solve for "x" in order to find its value.

So you get the following result:

(x)(\frac{1}{32})=2.3\\\\x=(2.3)(32)\\\\x=73.6

8 0
2 years ago
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