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Mice21 [21]
3 years ago
12

Pls help and thank youuuuuuuu

Mathematics
1 answer:
AveGali [126]3 years ago
8 0

Answer:

See below.

Step-by-step explanation:

5 students have an iPad.

20 students have an iPod.

5 + 20 = 25

The total is 25 students.

a. iPod/iPad = 20/5 = 4/1

b. iPad/iPod = 5/20 = 1/4

c. iPad/total = 5/25 = 1/5

d. iPod/total = 20/25 = 4/5

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A group of statistics students decided to conduct a survey at their university to estimate the average (mean) amount of time stu
shusha [124]

Answer:

C. [21.80, 22.80]

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{1-0.95}{2} = 0.025

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 1-0.025 = 0.975, so z = 1.96

Now, find M as such

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

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

M = 1.96\frac{6}{\sqrt{554}} = 0.5

The lower end of the interval is the sample mean subtracted by M. So it is 22.3 - 0.5 = 21.8 hours.

The upper end of the interval is the sample mean added to M. So it is 22.3 + 0.5 = 22.8 hours

So the correct answer is:

C. [21.80, 22.80]

6 0
3 years ago
Read 2 more answers
9. If f(x)=-2x^2+4x-6, <br> then f(2)=
Romashka-Z-Leto [24]

Answer:

f(2) = -6

General Formulas and Concepts:

Order of Operations: BPEMDAS

Substitution and Evaluation

Step-by-step explanation:

<u>Step 1: Define</u>

f(x) = -2x² + 4x - 6

f(2) is x = 2

<u>Step 2: Solve</u>

  1. Substitute:                          f(2) = -2(2)² + 4(2) - 6
  2. Exponents:                         f(2) = -2(4) + 4(2) - 6
  3. Multiply:                              f(2) = -8 + 8 - 6
  4. Add:                                    f(2) = -6
3 0
3 years ago
Factor the polynomials comletely, then solve 9x^2 +66x+21 = 0​
son4ous [18]

Answer:

x= -1/3

x = -7

Step-by-step explanation:

9x^2 +66x+21 = 0​

a=9 b=66 c=21

quadratic formula

x=(-b +/- square root of (b^2 – 4ac))/(2a)

x = (-66 +/- square root of (66^2 -4*9*21))/(2*9)

x = (-66 +/- square root of (4356 -756))/(18)

x = (-66 +/- square root of (3600))/(18)

x = (-66 +/- 60)/18

split the fraction

(-66 +/- 60)/18 = -6/18 and -126/18 because of the +/-

x = -6/18  x = -126/18

x = -1/3   x = -7

7 0
3 years ago
Read 2 more answers
2x + 5 = 25<br> please help
makvit [3.9K]

Answer:

x = 10

Step-by-step explanation:

2x + 5 = 25

-5

2x = 20

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x = 10

7 0
3 years ago
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What would the equation be if the y intercept is -6 and the x intercept is 4
Daniel [21]

Answer:

y=\frac{3}{2} x-6

Step-by-step explanation:

Used a graphing calculator,

hope this helps.

3 0
3 years ago
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