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4 years ago

What is 1/4 of £42!!

Mathematics

2 answers:

Vesnalui [34]4 years ago

5 0

Answer:

10.50

Step-by-step explanation:

1/4*42=10.50

KiRa [710]4 years ago

3 0

Answer:

£10.50.

Step-by-step explanation:

1/ 4 of 42

= 42/4

= £10.50.

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Rewrite the expression using distributive property : 30x + 6

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This cannot be done, but it can be factored as: 6(5x + 1)

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3 years ago

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4 years ago

How many students must be randomly selected to estimate the mean weekly earnings of students at one college? We want 95% confide

kari74 [83]

Answer:

The sample of students required to estimate the mean weekly earnings of students at one college is of size, 3458.

Step-by-step explanation:

The (1 - α)% confidence interval for population mean (μ) is:

$CI=\bar x\pm z_{\alpha/2}\times \frac{\sigma}{\sqrt{n}}$

The margin of error of a (1 - α)% confidence interval for population mean (μ) is:

$MOE=z_{\alpha/2}\times \frac{\sigma}{\sqrt{n}}$

The information provided is:

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The critical value of z for 95% confidence level is:

$z_{\alpha/2}=z_{0.05/2}=z_{0.025}=1.96$

Compute the sample size as follows:

$MOE=z_{\alpha/2}\times \frac{\sigma}{\sqrt{n}}$

$n=[\frac{z_{\alpha/2}\times \sigma }{MOE}]^{2}$

$=[\frac{1.96\times 60}{2}]^{2}$

$=3457.44\\\approx 3458$

Thus, the sample of students required to estimate the mean weekly earnings of students at one college is of size, 3458.

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