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3 years ago

Tommy posts 11 pictures on Instagram every day. Elizabeth posts 15 pictures on Instagram every day.

Mathematics

2 answers:

Leviafan [203]3 years ago

8 0

Where’s is the question bruv?

Gennadij [26K]3 years ago

6 0

Answer:

Step-by-step explanation:

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A tire manufacturer is interested in testing the fuel economy for two different tread patterns. Tires of each tread type are dri

Minchanka [31]

Using the t-distribution, it is found that the 99% confidence interval for the difference is (0.058, 3.462).

We are given the standard deviation for the samples, hence, the t-distribution is used to solve this question.

The standard errors are given by:

$s_A = \frac{1.79}{\sqrt{18}} = 0.4219$

$s_B = \frac{1.95}{\sqrt{18}} = 0.4596$

For the distribution of differences, the mean and the standard error are given by:

$\overline{x} = \mu_A - \mu_B = 23.95 - 22.19 = 1.76$

$s = \sqrt{0.4219^2 + 0.4596^2} = 0.6239$

The interval is given by:

$\overline{x} \pm ts$

The critical value for a two-tailed 99% confidence interval with 18 + 18 - 2 = 34 df is t = 2.7284.

Then:

$\overline{x} - ts = 1.76 - 2.7284(0.6239) = 0.058$

$\overline{x} + ts = 1.76 + 2.7284(0.6239) = 3.462$

The 99% confidence interval for the difference is (0.058, 3.462).

For more on the t-distribution, you can check brainly.com/question/16162795

3 0

3 years ago

Line K has a slope of -5. Line j is perpendicular to line k and passes through the point (5, 9). Create the equation for line j.

alisha [4.7K]

Answer:

y = 1/5 x + 8

Step-by-step explanation:

slope of line j: m = -(1/-5) = 1/5

j pass (5,9): (y-9)/(x-5) = 1/5

y-9 = 1/5(x-5) = 1/5 x - 1

y = 1/5 x + 8

7 0

3 years ago

Simplify 9x^8 divided by 12x^5.

Dmitry_Shevchenko [17]

Ok, so rembmer some basica exponential rules and some fraction rules

(ab)/(cd)=(a/c)(b/d)
and
$\frac{x^n}{x^m} =x^{n_m}$

so
$\frac{9x^8}{12x^5}=( \frac{9}{12} )( \frac{x^8}{x^5} )=( \frac{3}{4} )( x^{8-5} )= ( \frac{3}{4} )( x^{3} )= \frac{3x^3}{4}$

6 0

4 years ago

The price of a pair of shoes after a 25% discount was $18.50. what was the original cost?

Likurg_2 [28]

After a 25% discount...means that u paid 75%

so 75% of the original cost is 18.50...
0.75x = 18.50.....with x being the original cost
x = 18.50 / 0.75
x = 24.666 rounds to 24.67 <==

7 0

3 years ago

What the surface area of the cube

kari74 [83]

Answer:

sum of area of All six faces of cube is it's total surface area

Step-by-step explanation:

surface area of a cube =6*area of faces =6*(side) square

3 0

3 years ago