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3 years ago

Consider a population consisting of values 2, 3, 5, 7. what is the population standard deviation?

Mathematics

1 answer:

denis23 [38]3 years ago

6 0

Answer:

The population standard deviation is 1.92.

Step-by-step explanation:

Population mean:

Sum of all values divided by the number of values. Thus:

$M = \frac{2 + 3 + 5 + 7}{4} = 4.25$

Population standard deviation:

Square root of the division between the sum of the difference squared of each value and the mean, and the number of values. Thus.

$S = \sqrt{\frac{(2-4.25)^2 + (3-4.25)^2 + (5-4.25)^2 + (7-4.25)^2}{4}} = 1.92$

The population standard deviation is 1.92.

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Suppose that in a certain county 37% of voters are registered as Democrats, 29% as Republicans, 7% as Green party, and the rest

Fantom [35]

Answer:

$0.66$

Step-by-step explanation:

GIVEN: Suppose that in a certain county $37\%$ of voters are registered as Democrats, $29\%$ as Republicans, $7\%$ as Green party, and the rest are considered Independents. You conduct a poll by calling registered voters in the county at random.

TO FIND: Probability that the first call will be to either a Democrat or a Republican.

SOLUTION:

Lets total population of county be $100x$ .

voters registered as Democrats $=37\%=\frac{37}{100}\times100x$

$=37x$

voters registered as Republicans $=29\%=\frac{29}{100}\times100x$

$=29x$

voters registered as Green party $=7\%=\frac{7}{100}\times100x$

$=7x$

Probability that first call will be to Democrats $P(A)=\frac{\text{total democrats}}{\text{total voters}}$

$=\frac{37x}{100x}=0.37$

Probability that first call will be to Republican $P(B)=\frac{\text{total republicans}}{\text{total voters}}$

$=\frac{29x}{100x}=0.29$

probability that the first call will be to either a Democrat or a Republican

$=P(A)+P(B)$

$=0.37+0.29$

$=0.66$

Hence the probability that the first call will be to either a Democrat or a Republican is $0.66$

6 0

4 years ago

Find DF AC=600 CB=480 AB=360

Mandarinka [93]

............................,,,;,,...............:......

6 0

4 years ago

Consider the radical equation √n+ 4 = n-2.

muminat

Answer:

Pretty sure neither of them work. So prolly the last one. Hope I’m right :)

3 0

3 years ago

On march 24, 1989, the exxon valdez oil tanker ran aground and leaked millions of gallons of oil into prince william sound. the

Alja [10]

hours did it take for oil to cover the area = 592

The correct option is B.

<h3>What is geometrical figure?</h3>

Geometrical shapes are the shapes that depict the shapes of various items. Various figures have two dimensions, while others have three. Only the x and y axes are used for two-dimensional figures, whereas the x, y, and z axes are used for three-dimensional shapes.

<h3>According to the given information:</h3>

Given,

Area = 11000m²

Radius = .10m/h

We know the area of the circle:

Area = πr²

The relation between parameter:

Area = πr²

11000 = 3.14 * (0.10t)²

Dividing both side by 3.14

11000/3.14 = (3.14 * (0.10t)²)/3.14

by solving this we get:

(.10t)² = 3503.184

.10t = 59.187

dividing both side by 0.10

t = 59.187/.10

t = 591.877

t = 592

hours did it take for oil to cover the area = 592

To know more about geometrical figure visit:

brainly.com/question/17321335

#SPJ4

4 0

2 years ago

What is the square root of 9

GalinKa [24]

3 is the answer. 3 X 3 = 9
I'm glad I could help

7 0

4 years ago