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Kazeer [188]
3 years ago
9

I need help with this question

Mathematics
1 answer:
Feliz [49]3 years ago
8 0

Answer:

B = 5 and F = 5

Step-by-step explanation:

Step 1: B = 5 because 350(5) = 1750

Step 2: F = 5 because 525(5) = 2625

Step 3: 2625 +  1750 = 4375

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31.205*4.97/1.925 correct to 1 significant number
Sonja [21]

Answer:80

Step-by-step explanation:

31.205= 31

4.97=5

1.925=2

31*5/2=155/2=77.5=80 (1 significant figure)

6 0
2 years ago
A recent study from the University of Virginia looked at the effectiveness of an online sleep therapy program in treating insomn
Ludmilka [50]

Answer:

1. The 99% confidence interval for the difference in average is -6.47377 < μ₁ - μ₂ < -11.34623

2. The possible issues in the calculations includes;

a. The confidence level used in the confidence interval can influence the result of the confidence interval observed

b. The sample size is small

Step-by-step explanation:

1. The number of adults with insomnia in the sample = 45

The number of adults that participated in the therapy, n₁ = 22

The number of candidates that served as control group, n₂ = 23

The average score for the for the 22 participants of the program, \overline x_1 = 6.59

The standard deviation for the 22 participants of the program, s₁ = 4.10

The average score for the for the 23 subjects in the control group, \overline x_2 = 15.50

The standard deviation for the 23 subjects in the control group, s₂ = 5.34

The confidence interval for unknown standard deviation, σ, is given by the following expression;

\left (\bar{x}_{1}- \bar{x}_{2}  \right )\pm t_{\alpha /2}\sqrt{\dfrac{s_{1}^{2}}{n_{1}}+\dfrac{s_{2}^{2}}{n_{2}}}

α = 1 - 0.99 = 0.01

α/2 = 0.005

The degrees of freedom, df = 22 - 1 = 21

t_{\alpha /2} = t_{0.005, \, 21} = 1.721

Therefore, we have;

\left (6.59- 15.5  \right )\pm1.721 \cdot \sqrt{\dfrac{4.10^{2}}{22}+\dfrac{5.34^{2}}{23}}

The 99% confidence interval for the difference in average is therefore given as follows;

-6.47377 < μ₁ - μ₂ < -11.34623

Therefore, there is considerable evidence that the participants in the survey  had lower average score than the subjects in the control group

2. The possible issues in the calculations are;

a. The confidence level used in the confidence interval can influence the result of the confidence interval observed

b. The sample size is small

5 0
2 years ago
What is 91(3456+9878kh)-3(4564-9087)​
goldfiish [28.3K]
The answer is 328065+ 898898hk hope I helped
6 0
3 years ago
A black mamba snake can travel 28 ft./s how far can a black mamba travel In 60 seconds
zlopas [31]

1680 ft./60s

28 ft in a second, so multiply 28 by 60 and you get 1680.

8 0
3 years ago
Read 2 more answers
A bicycle sells for $240. The sales tax is 6%. What is the total cost of the bicycle?
Bogdan [553]
Answer: $254.40

Explanation:
240*1.06= 254.40

Another way:
240*.06= 14.40
240+14.40= 254.40

The total would be $254.40
8 0
3 years ago
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