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3 years ago

Which inequalities are true?

Mathematics

1 answer:

valentina_108 [34]3 years ago

6 0

B is correct as -4 is smaller than 7
d is correct as -30 is smaller than -18
e is correct as -3 is bigger than -8

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The waiting times between a subway departure schedule and the arrival of a passenger are uniformly distributed between 00 and 77

Inga [223]

Answer:

dont kno but look me up on ig bbg_tay_ 4kt dont kno what im on but im just on dhis to get all my fan to kno i was on here ik yuh thinkin dhis is crazy bc yuh was ready nba youngboy members was on here

Step-by-step explanation:

4 0

3 years ago

Question 7plzzz whit a cherry on top

evablogger [386]

I think it's 12.
-8 * 3 = -24 and -6÷3=-2
so -24÷-2=12

4 0

3 years ago

Suppose we are interested in analyzing the weights of NFL players. We know that on average, NFL players weigh 247 pounds with a

Diano4ka-milaya [45]

Answer:

a) The standard error would be of 8.58 pounds.

b) The margin of error is 14.11 pounds.

c) The 90% confidence interval for the population mean is between 232.89 pounds and 261.11 pounds

Step-by-step explanation:

a.What is the standard error?

The standard error is

$s = \frac{\sigma}{\sqrt{n}}$

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

$s = \frac{47}{\sqrt{30}} = 8.58$

The standard error would be of 8.58 pounds.

b.What is the margin of error at 90% confidence?

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

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 $1-0.05 = 0.95$ , so $z = 1.645$

Now, find the margin of error M as such

$M = z*s = 1.645*8.58 = 14.11$

The margin of error is 14.11 pounds.

c. Using my sample of 30, what would be the 90% confidence interval for the population mean?

Lower bound: Sample mean subtracted by the margin of error.

247 - 14.11 = 232.89 pounds

Upper bound

247 + 14.11 = 261.11 pounds

The 90% confidence interval for the population mean is between 232.89 pounds and 261.11 pounds

4 0

3 years ago

A part is being machined. The starting thickness

Free_Kalibri [48]

Im mot sure of the answer

4 0

3 years ago

Match each complex number with its equivalent expression i^157 i^315 i^102 i^76

ryzh [129]

Answers:

$i^{157} = i\\\\i^{315} = -i\\\\i^{102} = -1\\\\i^{76} = 1\\\\$

=====================================================

Explanation:

By definition, $i = \sqrt{-1}$

Squaring both sides gets us $i^2 = -1$

Then multiply both sides by i to get $i^3 = -i$

Repeat the last step and you should get $i^4 = -i^2 = -(-1) = 1$

---------------

Notice we have this pattern going on:

$i^0 = 1\\\\i^1 = i\\\\i^2 = -1\\\\i^3 = -i\\\\i^4 = 1\\\\$

Once we reach i^4, we start the process over again.

It repeats every 4 terms.

This means we'll divide the exponent over 4 and look at the remainder. We ignore the quotient completely.

157/4 = 39 remainder 1

That remainder 1 is the exponent of the simplified term

$i^{157} = i^1 = i$

---------------

Similarly,

315/4 = 78 remainder 3

So $i^{315} = i^3 = -i$

---------------

102/4 = 25 remainder 2

$i^{102} = i^2 = -1$

----------------

76/4 = 19 remainder 0

$i^{76} = i^0 = 1$

8 0

2 years ago