3 years ago

Which ones are correct?

Mathematics

1 answer:

emmasim [6.3K]3 years ago

7 0

Answer:

Th answer is D

Step-by-step explanation:

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Mathematics achievement test scores for 300 students had a mean and a variance equal to 550 and 3,600, respectively. If the dist

blondinia [14]

Answer:

number of scores between 490 and 610 is = 0.68 x 300 = 204

Step-by-step explanation:

The concept of Probability distribution is applied as it relates to the Z-scores.

Z = X - Mean /Standard deviation

The detailed steps and appropriate substitution is as shown in the attached file.

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3 years ago

Four times a number, decreased by 2, is 8 more than the product of six and the number.

Svetradugi [14.3K]

Answer:

-5

Step-by-step explanation:

4x -2 = 8 + 6x

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2 years ago

42 is 8% of what number

Setler [38]

8%=0.08
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So your answer is 525

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What is the value of X?<br><br> What is the value of Y?<br><br> What is the value of Z?

baherus [9]

Answer:

The answer is

$x = 12 \\ y = 20 \\ z = 15$

Step-by-step explanation:

By using Pythagoras low

Then we can find that

${y}^{2} = {x}^{2} + {16}^{2} \\ {z}^{2} = {x}^{2} + {9}^{2} \\ {y}^{2} + {z}^{2} = {25}^{2} \\ then \\ {x}^{2} + {9}^{2} + {x}^{2} + {16}^{2} = {25}^{2} \\ 2 {x}^{2} = 288 \\ x = 12 \\ By \: substituting \: x \: into \: the \: previous \: equations \\ then \: \\ y = 20 \\ z = 15$

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3 years ago

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