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3 years ago

Find the product 12, -5 (a) -60 (b) 17 (c) 7 (d) -2.4

1 answer:

6 0

The correct answer is: [A]: " -60 " .
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Explanation:
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We are asked to find the "product" of the two numbers, " 12 " and " -5 " .
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The "product" refers to the result of "multiplying" numbers.
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So, what is the value, when "12" is multiplied by "-5" ?
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<u>Note</u>: When a "positive number" is multiplied by a "negative number" , the result is a "negative number" .
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So; the product of "12" and "-15" is: " 12 * -5 " ; which equals: " -60 " ;

which is: Answer choice: [A]: " - 60 " .
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Try this option:
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3 years ago

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3 years ago

A random sample of 77 fields of corn has a mean yield of 26.226.2 bushels per acre and standard deviation of 2.322.32 bushels pe

PSYCHO15rus [73]

Answer:

Therefore the 95% confidence interval is (25,707.480 < E < 26,744.920)

Step-by-step explanation:

n = 77

mean u = 26,226.2 bushels per acre

standard deviation s = 2,322.32

let E = true mean

let A = test statistic

Find 95% Confidence Interval

let A = (u - E) * ( $\sqrt{n}$ / s) be the test statistic

we want P( average_l < A < average_u ) = 95%

look for lower 2.5% and the upper 97.5% Because I think this is a 2-tail test

average_l = -1.96 which corresponds to the 2.5%

average_u = 1.96

P( -1.96 < A < 1.96) = 95%

P( -1.96 < (u - E) * ( $\sqrt{n}$ / s) < 1.96) = 95%

Solve for the true mean E ok

E < u + 1.96* (s / $\sqrt{n}$ )

from -1.96 < (u - E) * ( $\sqrt{n}$ / s)

E < 26,226.2 + 1.96*( 2,322.32 / $\sqrt{77}$ )

E < 26,226.2 + 518.7197348105429466

upper bound is 26,744.9197

u - 1.96* (s / $\sqrt{n}$ ) < E

26,226.2 - 518.7197348105429466 < E

25,707.48026519 < E

lower bound is 25,707.48026519

Therefore the 95% confidence interval is (25,707.480 < E < 26,744.920)

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3 years ago

Simplify the expression 10-4x(6+5-1) divided by 8+7

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Simple,

writing out the problem...

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Simplify it...

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-4x(11-1)

-4x(10)

-40x

Making it look like...

$\frac{10-40x}{15}$

Cancel out the common factors...

Thus making the answer:

$- \frac{2(4x-1)}{3}$ .

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3 years ago