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3 years ago

Please help, i'm horrible @ math :)

Mathematics

2 answers:

Blizzard [7]3 years ago

5 0

The answer would be -4 1/10

Sedbober [7]3 years ago

3 0

I believe the answer is −4 1/10. Hope that helped.

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Write twenty-three hundreds as a decimal

mina [271]

Answer:

0.023

Step-by-step explanation:

8 0

4 years ago

Read 2 more answers

The results of a national survey showed that on average, adults sleep 6.7 hours per night. Suppose that the standard deviation i

Roman55 [17]

Answer:

a) Atleast 75%

b) Atleast 88.9%

c) 95%

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 6.7

Standard Deviation, σ = 1.6

Chebyshev's Theorem:

Atleast $1 - \dfrac{1}{k^2}$ percent of data lies within k standard deviation of mean.

Empirical Rule:

Almost all the data lies within 3 standard deviation for a normal data.
Around 68% of data lies within 1 standard deviation of mean.
Around 95% of data lies within 2 standard deviation of mean.
Around 99.7% of data lies within 3 standard deviations o mean.

a) minimum percentage of individuals who sleep between 3.5 and 9.9 hours

$3.5 = \mu - 2\sigma = 6.7 - 2(1.6)\\9.9 = \mu + 2\sigma = 6.7 + 2(1.6)$

We have to find the percent of data lying within 2 standard deviation of mean.

Putting k = 2

$1 - \dfrac{1}{(2)^2} = 0.75 = 75\%$

Atleast 75% of of individuals who sleep between 3.5 and 9.9 hours.

b) minimum percentage of individuals who sleep between 2.7 and 10.7 hours

$2.7 = \mu - 3\sigma = 6.7 - 3(1.6)\\10.7 = \mu + 3\sigma = 6.7 + 3(1.6)$

We have to find the percent of data lying within 3 standard deviation of mean.

Putting k = 3

$1 - \dfrac{1}{(3)^2} = 0.889 = 88.9\%$

Atleast 88.9% of of individuals who sleep between 2.7 and 10.7 hours.

c) percentage of individuals who sleep between 3.5 and 9.9 hours per day.

Thus, we have to find the percentage of data lying within 2 standard deviation.

By empirical rule, around 95% of data lies within 2 standard deviation.

Thus, 95% of of individuals who sleep between 3.5 and 9.9 hours.

This is higher than the percentage obtained from Chebyshev's rule.

4 0

3 years ago

Please help me I don't know how to do this

dem82 [27]

To find ten percent, you divide by ten. Then multiply that answer by five to get fifty percent. Subtract that answer from the original price. But because this one is fifth you could just divide by two.

5 0

3 years ago

Read 2 more answers

Factorizar Sumas de cubo 1) 8x³ + 1 2) 27a³ + b³ 3) 8x³ + 1,000

frutty [35]

$\huge{\mathbb{{ANSWERS}}}$

1.) 8x³ + 1

 $\underline{ \tt{{(2x + 1) \times (4 {x}^{2} - 2x + 1)}}}$

2.) 27a³ + b³

 $\underline{ \tt{{(3a + b) \times (9{a}^{2} - 3ab + {b}^{2})}}}$

3.) 8x³ + 1,000

$\underline{ \tt{{8(x + 5) \times ( {x}^{2} - 5x + 25)}}}$

Note: My anwer is base on my knowledge

Hopefully Help:)

#CarryOnLearning

_MafiaQueen4

8 0

3 years ago

What is the answer to Y/-12=-3

allsm [11]

Answer:

Y=36

Step-by-step explanation:

y/-12=-3, you would multiply -3 by -12 to get rid of the denominator. -3*-12=36. Y=36. Hope this helps :)

7 0

4 years ago