Write answer as a decimal or whole number :)<br><br> What % of $89.50 = $39.38<br><br> 20 points

Please help!!<br> What is the value of x?

USPshnik [31]

Answer:

Step-by-step explanation:

4 0

3 years ago

An article presents voltage measurements for a sample of 66 industrial networks in Estonia. Assume the rated voltage for these n

kramer

Answer:

We accept the null hypothesis and conclude that voltage for these networks is 232 V.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 232 V

Sample mean, $\bar{x}$ = 231.5 V

Sample size, n = 66

Sample standard deviation, s = 2.19 V

Alpha, α = 0.05

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 232\\H_A: \mu \neq 232$

We use Two-tailed t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n-1}} }$ Putting all the values, we have

$t_{stat} = \displaystyle\frac{231.5- 232}{\frac{2.19}{\sqrt{66}} } = -1.8548$

Now,

$t_{critical} \text{ at 0.05 level of significance, 9 degree of freedom } = \pm 1.9971$

Since,

$|t_{stat}| > |t_{critical}|$

We accept the null hypothesis and conclude that voltage for these networks is 232 V.

4 0

3 years ago

como puedes saber con anticipacion el numero de cifras decimales que lleva el resultado de multiplicar un numero natural por un

Oduvanchick [21]

Answer:

The same number as in the multiplier

Step-by-step explanation:

The number of decimal places in the product is the sum of the decimal places in the factors.

A natural number is an integer. It has no decimal places.

So, the product has the product has the same number of decimal places as the multiplier.

For example, 2 × 3.45 = 6.90

The number 3.45 has two decimal places, so the product has two decimal places.

4 0

3 years ago

An H0-scale model railroad engine is 9 inches long. The H0 scale is 87 feet to 1 foot. How long is a real engine?

Semmy [17]

The real engine is 65.25 feet long

<h3>How to determine the length?</h3>

The scale is given as:

Scale = 87 feet to 1 foot

The scale length is given as

Scale length = 9 inches

Convert inches to feet

Scale length = 9/12 feet

The actual length is then calculated as:

Actual = 87 * 9/12 feet

Evaluate

Actual = 65.25 feet

Hence, the real engine is 65.25 feet long

Write answer as a decimal or whole number :) What % of $89.50 = $39.38 20 points