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3 years ago

Abigail says that all the numbers ending 1 are prime. Is Abigail correct or incorrect

Mathematics

2 answers:

Arada [10]3 years ago

7 0

Incorrect.......................

patriot [66]3 years ago

6 0

Incorrect.
Go through the numbers and you'll find un-prime numbers ending in 1:
21, 81, 121,...

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Rita offers to pay for 8 of her friends to play lazer tag, but 3 of them dont want to pay

Mrac [35]

Answer:

only 5 of her friends will play

Step-by-step explanation:

8-3=5

6 0

3 years ago

Read 2 more answers

Researchers are studying the distribution of subscribers to a certain streaming service in different populations. From a random

Katen [24]

Answer:

$CI = (0.17 - 0.27)\± 1.65\sqrt{\frac{(0.17)*(0.83) + (0.27)*(0.73)}{200}}$

Step-by-step explanation:

Given

$n = 200$

$x_1 = 34$ -- City C

$x_2 = 54$ --- City K

Required

Determine the 90% confidence interval

This is calculated using:

$CI = \bar x \± z\frac{\sigma}{\sqrt n}$

Calculating $\bar x$

$\bar x = \bar x_1 - \bar x_2$

$\bar x = \frac{x_1}{n} - \frac{x_2}{n}$

$\bar x = \frac{34}{200} - \frac{54}{200}$

$\bar x = 0.17 - 0.27$

For a 90% confidence level, the z-score is 1.65. So:

$z = 1.65$

Calculating the standard deviation $\sigma$

$\sigma = \sqrt{(\bar x_1)*(1 - \bar x_1) + (\bar x_2)*(1 - \bar x_2) }$

So:

$\sigma = \sqrt{(0.17)*(1 - 0.17) + (0.27)*(1 - 0.27) }$

$\sigma = \sqrt{(0.17)*(0.83) + (0.27)*(0.73)}$

So:

$CI = (0.17 - 0.27)\± 1.65\frac{\sqrt{(0.17)*(0.83) + (0.27)*(0.73)}}{\sqrt {200}}$

$CI = (0.17 - 0.27)\± 1.65\sqrt{\frac{(0.17)*(0.83) + (0.27)*(0.73)}{200}}$

7 0

2 years ago

Help me with this question i tried multiple time to solution it always wrong

maw [93]

7/9-1/3 or 7/9-3/9= 4/9 is the answer

4 0

3 years ago

A toolbox contains 12 screwdrivers and 11 wrenches. Each screwdriver has a mass of 1,298 grams, and each wrench has a mass of 2,

kupik [55]

Answer:

Each screwdriver has a mass of 1,298 grams, and each wrench has a mass of 2,282 grams.

Step-by-step explanation:

8 0

2 years ago

Find the number of sides of a regular polygon if the sum of its interior angle is 1440

scoundrel [369]

The formula is 180(n-2)= 1140 then you divide 1140 by 180 to get 8 so then it would like like n-2=8 add the 2 over and n (being the number of sides)= 10 so your answer will be 10

8 0

3 years ago