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4 years ago

A group of 5 painters can paint a house in 21 hours. How long would it take for a group of 7 painters to paint the same house?

Mathematics

2 answers:

Lemur [1.5K]4 years ago

7 0

Answer: 29.4

Step-by-step explanation:

Anettt [7]4 years ago

5 0

Answer:

Step-by-step explanation:

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A study1 conducted in July 2015 examines smartphone ownership by US adults. A random sample of 2001 people were surveyed, and th

dusya [7]

Answer:

a) Null hypothesis: $p_{1} = p_{2}$

Alternative hypothesis: $p_{1} \neq p_{2}$

b) $z=\frac{p_{1}-p_{2}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{1}}+\frac{1}{n_{2}})}}$ (1)

Where $\hat p=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{688+671}{989+1012}=0.679$

c) $z=\frac{0.696-0.663}{\sqrt{0.679(1-0.679)(\frac{1}{989}+\frac{1}{1012})}}=1.58$

d) For this case we see that $\hat p_1 > \hat p_2$ so then the answer for this cae would men

Step-by-step explanation:

Information given

$X_{1}=688$ represent the number of men with smartphone

$X_{2}=671$ represent the number of women with smartphone

$n_{1}=989$ sample of men selected

$n_{2}=1012$ sample of women selected

$p_{1}=\frac{688}{989}=0.696$ represent the proportion of men with smartphone

$p_{2}=\frac{671}{1012}=0.663$ represent the proportion of women with smartphone

$\hat p$ represent the pooled estimate of p

z would represent the statistic

$p_v$ represent the value

Part a

We want to test if we have difference in the proportion owning a smartphone between men and women, the system of hypothesis would be:

Null hypothesis: $p_{1} = p_{2}$

Alternative hypothesis: $p_{1} \neq p_{2}$

Part b

The statistic for this case is given by:

$z=\frac{p_{1}-p_{2}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{1}}+\frac{1}{n_{2}})}}$ (1)

Where $\hat p=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{688+671}{989+1012}=0.679$

Part c

Replacing the info given we got:

$z=\frac{0.696-0.663}{\sqrt{0.679(1-0.679)(\frac{1}{989}+\frac{1}{1012})}}=1.58$

Part d

For this case we see that $\hat p_1 > \hat p_2$ so then the answer for this cae would men

4 0

3 years ago

Pedro built nine bicycles in 25h. At this rate how many bicycles will he build in a 40 h week?

Anna11 [10]

Answer:

0.009

Step-by-step explanation:

1. 9/25

2. x/40

8 0

3 years ago

7. Which answer is equal to (f – g)(5) or f(5) – g(5), given f(x) = x + 2 and g(x) = x² + 5?

erastova [34]

Hello:
<span> (f – g)(5) = f(5) – g(5) = (5+2)-((5)²+5) = 7-30
</span> (f – g)(5) = -23

6 0

3 years ago

WILL GIVE BRAINLIEST IF YOUR RIGHT!!!!

Crazy boy [7]

Answer:

I.I

R.R

Step-by-step explanation:

R.R would be R.RRRR......

and I.I would be I.IIII...

5 0

3 years ago

Read 2 more answers

Mrs. Hidalgo paid $30 for 4 students to visit an art museum. Find the cost for 20 students.

Bond [772]

Answer:

The cost for 20 students would be $120

Step-by-step explanation:

We know that 4x5=20 therefore we will multiply 30x4 which will give us 120.

Our final answer would be $120

8 0

3 years ago