3 years ago

What is the result when 75 is decreased by 40%

Mathematics

1 answer:

RSB [31]3 years ago

7 0

30 is 40% of 75 so it should be 45

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For a 95% confidence interval what would the sample size need to be as it's most conservative to have a 2% margin of error

aleksley [76]

Answer:

The size of the sample 'n' = 2401

Step-by-step explanation:

Step:1

Given that the margin of error = 2 % = 0.02

The margin of error is determined by

$M.E = \frac{Z_{0.05} \sqrt{p(1-p)} }{\sqrt{n} }$

we know that the proportion

$\sqrt{p(1-p)} < \frac{1}{2}$

Step:2

The margin of error is determined by

$0.02 = \frac{1.96( \frac{1}{2} ) }{\sqrt{n} }$

$\sqrt{n} = \frac{1.96}{2 X 0.02}$

√n = 49

Squaring on both sides, we get

n = 49 × 49

n = 2401

Final answer:-

The size of the sample 'n' = 2401

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3 years ago

On a floor plan for Roscdale Middde School, 1l inch

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Answer:

The answer is A) 20 feet by 30 feet

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tigry1 [53]

Answer:

72cm squared

Step-by-step explanation:

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3 years ago

What is 20-17.16 because im confused

goblinko [34]

Answer:

2.84

Step-by-step explanation:

20.00 - 17.16 : If you think of it with zeros it might help

2.84 when solved

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2 years ago

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If two angles are complementary each angle is called a complement of the other if two angles are supplementary each angle is cal

professor190 [17]

Remember that complementary angles add to 90 degrees.

so therefor, you can find the complement of m<A by solving

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^^^ This explains the second part.

The compliment of a compliment can be found by subtracting the known compliment from 90 :)

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3 years ago

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