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3 years ago

There are 90 total days in winter. If it snowed on 30% of the days, on how many days of winter did it snow?

Mathematics

2 answers:

olganol [36]3 years ago

7 0

Answer:

27 days

Step-by-step explanation:

Well, there's two ways we could do this (which I do). One way is easier with a calculator, one is useful when you cannot use a calculator.

EASY CALCULATOR METHOD

30% as a decimal is 0.3, so if you multiply 90 by 0.3, you can easily find 30%. So:

90 x 0.3 = 27 days.

NON CALCULATOR METHOD

To find 10% of something, we divide the original value by 10. Therefore, we just need to find 10% and multiply that value by 3 to get 30%. So:

90/10 = 9 days (10%)

9 x 3 = 27 days (30%)

Either way both give you the same answer of 27 days.

Artemon [7]3 years ago

4 0

Answer:

Step-by-step explanation:

30%=0.3 in decimal form

90×0.3=27

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Brainliest + 20 points to whoever helps!!!

Darya [45]

Answer:

D. The standard deviation is known and n > 30.

Step-by-step explanation:

Your sample size is greater than 30.
Data points should be away from each other.
Your data should be commonly categorized.
Your data should be randomly picked from a population. Each item should have an equal chance of being selected.
The sample sizes should be equal.

8 0

3 years ago

A square room has a tiled floor with 81 square tiles. How many tiles are along an edge of the room?

Sladkaya [172]

Answer:

36 tiles

Step-by-step explanation:

Because the room is square, the numbers of tiles along the edge of the room were multiplied by the same number, meaning that:

81 = x²

So to find x, we must square root both sides of the equation:

$\sqrt{81} = \sqrt{x^2}$

x = 9

So the length of one side is 9 tiles. Now to calculate the circumference, as each side of a square is the same length, we can multiply this number by 4:

9 * 4 = 36

So there are 36 tiles along the edge of the room.

Hope this helps!

4 0

3 years ago

The radii of two similar cones are 1 and 2.5. What is the ratio of their volumes?

algol13

Answer:

Assuming the cones are the same height, then

V1 = pi * r^2 * h/3 = 3.14159*1^2*h/3

V2 = 3.14159*2.5^2*h/3 = 3.14159*6.25*h/3

V1/V2=(3.14159*h/3)/(3.14159*6.25)*h/3

V1/V2 = 1/6.25 = .16

V2/V1=(3.14159*6.25)*h/3/(3.14159*h/3)

V2/V1=6.25/1 = 6.25

6 0

2 years ago

USE PICTURE TO ANSWER QUESTION

VladimirAG [237]

Answer:

k = 24

y = 24x

Step-by-step explanation:

72/3 = 24

y = 24x

72 = 24(3)

72 = 72

Hope this helps!

6 0

3 years ago

Read 2 more answers

When you construct a confidence interval for the difference between two proportions, what do you use as an unbiased estimate of

Liono4ka [1.6K]

Answer:

Thus difference in sample proportions would be the unbiased estimate of the difference between the two proportions

Step-by-step explanation:

Given that you construct a confidence interval for the difference between two proportions

Let the proportions be p1 and p2

Sample sizes be n1 and n2

For samples of larger size randomly drawn we know that

p1 follows Normal with mean = sample proportion = p1 and

p2 is N with mean = sample proportion p2

Assuming these two proportions are independent we have

p1-p2 will follow a normal distribution with mean = p1-p2

Thus difference in sample proportions would be the unbiased estimate of the difference between the two proportions

3 0

4 years ago