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3 years ago

Determine the value of y when x=15 if y=6 when x =30

Mathematics

1 answer:

Vladimir79 [104]3 years ago

6 0

6+9=15
y+9=x
x=30
y+9=30
y=21

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2 years ago

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IRINA_888 [86]

Answer:

A function is a relation that maps inputs from a set called the domain, into outputs from a set called the range.

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So for example, if we have a relation that maps the input 2 into two different values:

f(2) = 4

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Then this is not a function.

In the case of the problem, we have a student as the input, and the hair color as the output.

So we will have something like:

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2 years ago

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Musya8 [376]

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3 years ago

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3 years ago

An article in the November 1983 Consumer Reports compared various types of batteries. The average lifetimes of Duracell Alkaline

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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.

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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.

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By the Central Limit Theorem, 4.5 hours.

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Subtraction of normal variables, so we subtract the means.

4.1 - 4.5 = -0.4

The mean is of -0.4 hours.

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2 years ago