Justin had 4 math worksheets for

Mathematics

2 answers:

olga55 [171]3 years ago

8 0

48 x 4 = 96, he answered 5 incorrectly therefore he answered (96 - 5) 91 correctly

devlian [24]3 years ago

5 0

Answer:187 questions answered correctly

Step-by-step explanation:

4*48=192

192-5=187

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What is the answer of 27.36/5.7

defon

The answer is 4.8
Simply divide 27.36 by 5.7

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4 years ago

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The sides of a triangle are in the ratio 3:4:5. What is the length of each side if the perimeter of the triangle is 30 cm

horsena [70]

One way:

3x + 4x + 5 x = 30
12 x = 30
Divide by 12
x = 2.5

3x = 7.5 (2.5x3)
4x = 10 (2.5x4)
5x = 12.5 (2.5x5)

7.5cm + 10cm +12.5cm = 30cm There are your three sides.

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Neporo4naja [7]

Answer:

the answer is C

Step-by-step explanation:

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3 years ago

On a standard IQ test, the standard deviation is 15. How many random IQ scores must be obtained if we want to find the true popu

igor_vitrenko [27]

Answer:

We need at least 4238 scores.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.97}{2} = 0.015$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.015 = 0.985$ , so $z = 2.17$

Now, find the margin of error M

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

How many random IQ scores must be obtained if we want to find the true population mean (with an allowable error of 0.5) and we want 97 percent confidence in the results

We need at least n scores, in which N is found when $M = 0.5$ . So