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2 years ago

8

A class has 4 boys and 10 girls. What is the ratio in the simplest form that compares a number of boys to a total number of stud

ents?
need the right answer

1 answer:

sergejj [24]2 years ago

6 0

Answer:

4 to 14 should be the right answer

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In a sample of 700 gas stations, the mean price for regular gasoline at the pump was $2.894 per gallon and the standard deviati

frez [133]

Answer:

$P(x < 2.892) = 4.36\%$

Step-by-step explanation:

Given

$N = 700$ --- Population

$\mu = 2.894$ -- Mean

$\sigma = 0.009$ --- Standard deviation

$n = 55$ -- Sample

Required: $P(x < 2.892)$

This question will be solved using the finite correction factor

First, calculated the z score

$z = \frac{x - \mu}{\sqrt{\frac{N -n}{N -1}} * \frac{\sigma}{\sqrt n}}$

$z = \frac{2.892 - 2.894}{\sqrt{\frac{700 -55}{700 -1}} * \frac{0.009}{\sqrt {55}}}$

$z = \frac{-0.002}{\sqrt{\frac{645}{699}} * \frac{0.009}{7.42}}$

$z = \frac{-0.002}{\sqrt{0.92} * \frac{0.009}{7.42}}$

$z = \frac{-0.002}{0.95917 * 0.0012129}$

$z = -1.71$

So:

$P(x < 2.892) = P(z < -1.71)$

Using z table

$P(x < 2.892) = 0.043633$

$P(x < 2.892) = 4.36\%$

3 0

3 years ago

One number is nine more than a second number. Four times the first is 6 less than 2 times the second. Find the numbers.

Masteriza [31]

9514 1404 393

Answer:

-12, -21

Step-by-step explanation:

Let x represent the first number. Then the second is x-9. The other relation is ...

4x = 2(x-9) -6

2x = -24 . . . . . subtract 2x, simplify

x = -12

x-9 = -21

The first number is -12; the second number is -21.

6 0

3 years ago

Justify your reasoning when solving the equation: 3(x+4)=8x-18

vampirchik [111]

Answer:

6

Step-by-step explanation:

3x plus 12= 8x -18

subtract twelve on both sides:

3x= 8x- 30

minus 8x on both sides:

-5= -30

divide:6

3 0

2 years ago

valina [46]

Answer:

each side of the patio measures ft.

5 0

2 years ago

Read 2 more answers

A 90% confidence interval is (35 45). What is the margin of error?

MA_775_DIABLO [31]

Answer:

option A 5

I hope it's correct

.....

7 0

3 years ago