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3 years ago

Please help, its homework not finished

Mathematics

2 answers:

Neporo4naja [7]3 years ago

4 0

1) -0.4

2) 3

3) -37

For each I just subsitubed

1) 3(1.2)-4

3.6-4 = -0.4

2) 12-(9)=3

3) 4(2)-45

8-45=-37

Citrus2011 [14]3 years ago

3 0

1) -0.4

2) 3

3) -37

For each I just subsitubed

1) 3(1.2)-4

3.6-4 = -0.4

2) 12-(9)=3

3) 4(2)-45

8-45=-37

that is the answer

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The answer is 1

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What is the value of x in the equation 2.5 minus 0.25 x = negative 3

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3 years ago

During a cold winter, the temperature stayed below zero for 10 days (ranging from −20 to −5). The variance of the temperatures o

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Answer:

The variance of the temperatures of the 10 day period must be at least zero.

Step-by-step explanation:

The variance is the expectation of the squared deviation of a random variable from its mean. It measures how far a set of numbers are spread out from their average value.

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3 years ago

Find the value of the angle θ rounded to 1 DP.

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Answer:

Step-by-step explanation:

Sin 21 = $\frac{opposite side}{hypotenuse}$

Sin 21 = $\frac{BC}{15}$

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5 0

2 years ago

1. A sample consists of 75 TV sets purchased several years ago. The replacement times of those TV sets have a mean of 8.2 years.

Greeley [361]

Answer:

8.2+/-0.25

= ( 7.95, 8.45) years

the 95% confidence interval (a,b) = (7.95, 8.45) years

Step-by-step explanation:

Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.

The confidence interval of a statistical data can be written as.

x+/-zr/√n

Given that;

Mean x = 8.2 years

Standard deviation r = 1.1 years

Number of samples n = 75

Confidence interval = 95%

z value(at 95% confidence) = 1.96

Substituting the values we have;

8.2+/-1.96(1.1/√75)

8.2+/-1.96(0.127017059221)

8.2+/-0.248953436074

8.2+/-0.25

= ( 7.95, 8.45)

Therefore the 95% confidence interval (a,b) = (7.95, 8.45) years

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2 years ago