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Lostsunrise [7]

3 years ago

7

Why were farmers able to cut their grain more easily and cheaply after 1834? A new type of grain was developed. The McCormick re

aper was invented. Farmers had a large supply of workers.

1 answer:

Marianna [84]3 years ago

4 0

Answer:

B. The McCormick reaper was invented.

Step-by-step explanation:

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Mark wants to know how many families in his neighborhood plan to attend the neighborhood party. He puts all 80 of the neighborho

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A. No, this is not a valid inference because he asked only 20 families

Step-by-step explanation:

You cannot assume that those are the only families that would want to go; you have to ask all the families.

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What is the coefficient in the following expression?

Y_Kistochka [10]

The coefficient is 4 because it is placed before x.

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3 years ago

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Darina [25.2K]

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3 years ago

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Tamiku [17]

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2 years ago

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Suppose that f(x) is the (continuous) probability density function for heights of American men, in inches, and suppose that f(69

anastassius [24]

Answer:

(a) 7.6%

(b) 46.2% 42.4%

Step-by-step explanation:

(a)According to the definition of Continuous probability distribution

$f(x) = \frac{d}{dx}F(x)$

$f(x) = \frac{F(x + h) - F(x - h)}{(x + h) - (x - h)}$

$f(69) = \frac{F(69 + 0.2) - F(69 - 0.2)}{0.4}$

⇒ 0.19 × 0.4 = F(69.2) - F(68.8)

⇒ F(69.2) - F(68.8) = 0.076

⇒ 7.6%

(b) Given F(69) = 0.5

$f(x) = \frac{d}{dx}F(x)$

$f(x) = \frac{F(x) - F(x - h)}{x - (x - h)}$

$f(69) = \frac{F(69) - F(69 - 0.2)}{0.2}$

⇒ 0.19 × 0.2 = F(69) - F(68.8)

⇒ F(68.8) = 0.5 - 0.038 = 0.462

⇒ 46.2%

$f(x) = \frac{d}{dx}F(x)$

$f(x) = \frac{F(x) - F(x - h)}{x - (x - h)}$

$f(69) = \frac{F(69) - F(69 - 0.4)}{0.4}$

⇒ 0.19 × 0.4 = F(69) - F(68.8)

⇒ F(68.8) = 0.5 - 0.076 = 0.424

⇒ 42.4%

5 0

3 years ago