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3 years ago

What is the solutions to X2 equals 8

Mathematics

1 answer:

stiv31 [10]3 years ago

6 0

Answer:

x = ±2sqrt(2)

Step-by-step explanation:

x^2 = 8

Take the square root of each side

sqrt(x^2) = ±sqrt(8)

x = ±sqrt(4*2)

We know that sqrt(ab) = sqrt(a)sqrt(b)

x = ±sqrt(4)sqrt(2)

x = ±2sqrt(2)

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3 years ago

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2 years ago

Suppose you have a sample of size 42 with a mean of 30 and a population standard deviation of 7.4. What is the maximal margin of

9966 [12]

Answer:

The maximal margin of error associated with a 95% confidence interval for the true population mean is 2.238.

Step-by-step explanation:

We have given,

The sample size n=42

The sample mean $\bar{x}=30$

The population standard deviation $\sigma=7.4$

Let $\alpha$ be the level of significance = 0.05

Using the z-distribution table,

The critical value at 5% level of significance and two tailed z-distribution is

$\pm z_{\frac{0.05}{2}}=\pm 1.96$

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$ME=z_{\alpha/2}(\frac{\sigma}{\sqrt{n}})$

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3 years ago

What is the solutions to X2 equals 8​

What is the solutions to X2 equals 8