2 years ago

Equation P: y + z = 4

1 answer:

4 0

$y+z=4\\
3y+7z=15\\

-3y-3z=-12\\
3y+7z=-12\\
4z=-24\\
z=-6$

Multiply the top equation by -3 and added to the second one.

By Elimination.

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Jackie made $28 babysitting last week. Her brother Joe made only 86% as much as she did. How much did joe make?

Alex777 [14]

28X0.86 = 24.08, therefore Joe made $24.08

4 0

3 years ago

Read 2 more answers

Suppose that distribution of the daily calcium intake of Americans is left skewed with a mean of 800 mg and a standard deviation

babymother [125]

Answer:

Explained below.

Step-by-step explanation:

According to the Central Limit Theorem if an unknown population is selected with mean μ and standard deviation σ and appropriately huge random samples (n > 30) are selected from this population with replacement, then the distribution of the sample means will be approximately normal.

Then, the mean of the sampling distribution of sample means is given by,

$\mu_{\bar x}=\mu$

And the standard deviation of the sampling distribution of sample means is given by,

$\sigma_{\bar x}=\frac{\sigma}{\sqrt{n}}$

So, if the sample of daily calcium intake of Americans collected is more than 30, then the sampling distribution of $\bar X$ will be approximately normal.