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uysha [10]
3 years ago
12

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Mathematics
1 answer:
slamgirl [31]3 years ago
4 0

Answer: x=50

Step-by-step explanation:

(3x+5)+(x-25)=180

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Is this set closed or not closed under the operation ? Negative integers under multiplication
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The set is not closed

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-4 * -3 = 12  this is not a negative integer

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Mr . Berg bought 5 number puzzles and 3 word puzzles for his students . The puzzles were $7 each . Mr . Berg used a $60 gift car
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Mr. Berg got $4 in change.

Step-by-step explanation:

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2 years ago
A random sample of 102 full-grown lobsters had a mean weight of 16 ounces and a standard deviation of 3.4 ounces. Construct a 98
pshichka [43]

Answer:

The best point estimate for a confidence interval estimating the population μ is 16 ounces.

The 98 percent confidence interval for the population mean μ is between 15.21 ounces and 16.79 ounces.

Step-by-step explanation:

We have the standard deviation for the sample, so we use the t-distribution to solve this question.

The best point estimate for a confidence interval estimating the population μ is

The sample mean, so 16 ounces.

T interval

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 102 - 1 = 101

98% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 101 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.98}{2} = 0.99. So we have T = 2.36

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2.36\frac{3.4}{\sqrt{102}} = 0.79

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 16 - 0.79 = 15.21 ounces

The upper end of the interval is the sample mean added to M. So it is 16 + 0.79 = 16.79 ounces

The 98 percent confidence interval for the population mean μ is between 15.21 ounces and 16.79 ounces.

4 0
2 years ago
the sum of the measurement of two angles is 183.61 angle one has a measure of 54 what is the measure in degrees of the second an
Dennis_Churaev [7]
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2 years ago
Pls help me I only have 2 minutes left winner gets brainliest
spin [16.1K]

Answer: B

Step-by-step explanation:

4 0
3 years ago
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