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2 years ago

8

During a drought, 3 inches of water evaporated out of a lake every hour. Which integer represents the water loss for a 7 hour pe

riod during the drought
A. -21
B. -10
C. -4
D. 21

1 answer:

Vesnalui [34]2 years ago

4 0

The answer is A (-21)

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A couple realizes a real estate financing of R $ 180,000.00, to be paid in 360 monthly installments, with an effective interest

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ANSWER: letter D

Step-by-step explanation:

In the tenth installment, the debit balance is, in reais, of

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The 1% interest on this amount results in:

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Thus, the tenth installment is, in reais, 500 + 1755 = 2255

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one number is four greater than another number.the sum of two numbers is 78.what are the two numbers?

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Step-by-step explanation:

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2 years ago

CITY |. Temperature (°F) St. Louis | 32 Montreal |. -18 Buffalo. | -8 Orlando. |. 68 Juneau. |. -26 By noon, the temperature In

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Answer:

6°F

58°F

Step-by-step explanation:

From the data Given :

Temperature rise in Buffalo by noon time = 14°F

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Rise in temperature = 14°F

Therefore, temperature at noon = (-8 + 14)°F = 6°F

B.)

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(32 - (-26))°F

32 + 26

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Temperature in St. Louis is 58°F higher

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3 years ago

Please need help thank you

telo118 [61]

Answer:

2, 3/4 and 1

Step-by-step explanation:

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2 years ago

Suppose that a college determines the following distribution for X = number of courses taken by a full-time student this semeste

lidiya [134]

Answer:

$E(X) = \sum_{i=1}^n X_i P(X_i) = 3*0.07 +4*0.4 +5*0.25 +6*0.28= 4.74$ In order to find the variance we need to calculate first the second moment given by:

$E(X^2) = \sum_{i=1}^n X^2_i P(X_i) = 3^2*0.07 +4^2*0.4 +5^2*0.25 +6^2*0.28= 23.36$ And the variance is given by:

$Var(X) = E(X^2) +[E(X)]^2 = 23.36 -[4.74]^2 = 0.8924$

And the deviation would be:

$Sd(X) =\sqrt{0.8924} =0.9447$

Step-by-step explanation:

Previous concepts

The expected value of a random variable X is the n-th moment about zero of a probability density function f(x) if X is continuous, or the weighted average for a discrete probability distribution, if X is discrete.

The variance of a random variable X represent the spread of the possible values of the variable. The variance of X is written as Var(X).

Solution to the problem

For this case we have the following distribution given:

X 3 4 5 6

P(X) 0.07 0.4 0.25 0.28

We can calculate the mean with the following formula:

$E(X) = \sum_{i=1}^n X_i P(X_i) = 3*0.07 +4*0.4 +5*0.25 +6*0.28= 4.74$

In order to find the variance we need to calculate first the second moment given by:

$E(X^2) = \sum_{i=1}^n X^2_i P(X_i) = 3^2*0.07 +4^2*0.4 +5^2*0.25 +6^2*0.28= 23.36$

And the variance is given by:

$Var(X) = E(X^2) +[E(X)]^2 = 23.36 -[4.74]^2 = 0.8924$

And the deviation would be:

$Sd(X) =\sqrt{0.8924} =0.9447$

3 0

3 years ago