Ask question

Ask question

All categories

4 years ago

15

You calculate the number of spots on a pair of two dice that you roll, sides facing up (the total can be called "x"). this is al

so assuming the dice are not loaded (fair). the probability that x is at least 7 is

1 answer:

Daniel [21]4 years ago

6 0

It'l be pretty hard to get the same number in a row

You might be interested in

A city has a 5% sales tax. A book costs 32.55 after tax. How much did he cost before tax?

deff fn [24]

First step is to turn 5% into a decimal -- 0.05
Next, find out what 5% of $32.55 is by multiplying
0.05 x 32.55
= 1.6275
Round to the nearest cent
= $1.63
This is the amount of tax $32.55
If we want to know what it the book costs before tax we simply take the tax off.
$32.55 - $1.63
= $30.92

5 0

2 years ago

By law, an industrial plant can discharge not more than 500 gallons of waste water per hour, on the average, into a neighboring

Alisiya [41]

Answer:

We conclude that not more than 500 gallons of wastewater per hour, on average, is discharged into a neighboring lake.

Step-by-step explanation:

We are given that an industrial plant can discharge not more than 500 gallons of wastewater per hour, on average, into a neighboring lake.

Four one-hour periods are selected randomly over a period of one week. The following are observed:

1384, 683, 1534, 405

Let $\mu$ = <u><em>population average gallons of wastewater discharged per hour</em></u>

So, Null Hypothesis, $H_0$ : $\mu \leq$ 500 gallons {means that not more than 500 gallons of wastewater per hour, on the average, is discharged into a neighboring lake}

Alternate Hypothesis, $H_A$ : $\mu$ > 500 gallons {means that more than 500 gallons of wastewater per hour, on the average, is discharged into a neighboring lake}

The test statistics that will be used here is <u>One-sample t-test statistics</u> because we don't know about population standard deviation;

T.S. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample mean = $\frac{\sum X}{n}$ = 1001.5 gallons

s = sample standard deviation = $\sqrt{\frac{\sum (X - \bar X)^{2} }{n-1} }$ = 543.79

n = sample of periods = 4

So, <u><em>the test statistics</em></u> = $\frac{1001.5-500}{\frac{543.79}{\sqrt{4} } }$ ~ $t_3$

= 1.844

The value of t-test statistics is 1.844.

Since in the question we are not given with the level of significance so we assume it to be 5%. Now, at 0.05 level of significance, the t table gives a critical value of 2.353 at 3 degrees of freedom for the right-tailed test.

Since the value of our test statistics is less than the critical value of z as 1.844 < 2.353, so we have <u><em>insufficient evidence to reject our null hypothesis</em></u> as it will fall in the rejection region.

Therefore, we conclude that not more than 500 gallons of wastewater per hour, on average, is discharged into a neighboring lake.

4 0

3 years ago

I need an answer, and 16:1 doesn't work

Ivanshal [37]

Answer:

Scale factor: 4:1

Ratio of perimeter: 4:1

Step-by-step explanation:

So basically, there is difference between the ratio of areas and the scale factor.

The area of a shape is equal to the scale factor squared.

We know that the ratio of the 2 areas is 16:1

So, the scale factor must be: $\sqrt[2]{16}: \sqrt[2]{1}$ ,

Which is basically 4:1

Because the ratio of the scale factor is also equal to the ratio of the perimeter, the ratio of perimeters is also 4:1

5 0

2 years ago

Solve For v.<br> 12= -4v+2 (v+2)<br> Simplify your answer as much as possible.

eimsori [14]

Answer:

v=-4

Step-by-step explanation:

If not, idk. Shoot me or sue me or whatever feels right, I guess.

4 0

4 years ago

Read 2 more answers

If you spin a spinner 2 times, what is the probability the sum of 2 numbers will be less than or equal to 9? (express your answe

kupik [55]

Answer: 2/8 i think

Step-by-step explanation:

4 0

3 years ago