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Svetllana [295]
3 years ago
7

I need help with this answer?

Mathematics
1 answer:
Bumek [7]3 years ago
7 0

Answer:

dont u have the answer

Step-by-step explanation:

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4 students is what percent of 20 students
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The answer is 5 percent.
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Toán lớp 8 <br> giải bất phương trình: 2x + 2 &gt; 4
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Answer:

x>1

Step-by-step explanation:

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Who know how to do this 100% smart
chubhunter [2.5K]

Answer:

1- \frac{1}{2}

2- 1

3- -2

Step-by-step explanation:

1-

Add the numbers : \frac{5}{10}

Reduce the fraction with 5 : \frac{1}{2}

Solution : \frac{1}{2}

2-

Calculate the difference: \frac{-3}{-3}

Divide: 1

Solution: 1

3-

Subtract the numbers: \frac{6}{-3}

Reduce the fraction : -2

Solution: -2

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A number to the 10th power divided by the same number to the 7th power equals 64. What is the number?
Naddik [55]
X=4

Just trust me bro
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3 years ago
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An article in the November 1983 Consumer Reports compared various types of batteries. The average lifetimes of Duracell Alkaline
Allushta [10]

Answer:

The mean is of -0.4 hours.

Step-by-step explanation:

To solve this question, we need to understand the central limit theorem and subtraction of normal variables.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

Mean of the sample of 64 Duracell:

By the Central Limit Theorem, 4.1 hours.

Mean of the sample of 64 Eveready:

By the Central Limit Theorem, 4.5 hours.

Mean of the difference?

Subtraction of normal variables, so we subtract the means.

4.1 - 4.5 = -0.4

The mean is of -0.4 hours.

8 0
3 years ago
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