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3 years ago

7

The cost for a movie ticket is $7.00. The cost is reduced to $5 for groups of 10 or more. How many people must be in a group for

them to save a total of $30?

1 answer:

tia_tia [17]3 years ago

6 0

I think you would have to have a group of 7 people

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Before dividing, decompose 420 to make it easier to divide by 4.

den301095 [7]

Answer:

4/420=105

Step-by-step explanation:

decompose 42 and divide by 4 is 10 and is 20 divided by 4 is 5

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3 years ago

A _____ is a rule that assigns each value of the independent variable to exactly one value of the dependent variable.

Hatshy [7]

A <em>function </em>is a rule that assigns each vale of the independent variable to exactly one vale of the dependent variable.

The missing word is the function.

Point to remember:

The definition says that two values of x(independent variable ) may correspond to one value of y(dependent variable) but the vice versa is not true( means two values of y(dependent variable ) does not correspond to one value of x(independent variable) ). This explanation is very powerful tool to check that whether a relation is a function or not.

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3 years ago

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3/4 of a number increased by 1/2 is equal to 14. <br> find the number

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Answer:

21

Step-by-step explanation:

14*2=28

28(3/4)=21

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2 years ago

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Lita,Kala, and Rose entered a typing competition. Lita typed 2 times as fast as Kala. The ratio of the number of words Kala type

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If the ratio from Kala to Rose is 4:1, then for the 48 words Rose typed Kala typed 192 words. 48*4=192
Then Lita types twice as fast so 192*2=384.
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3 years ago

Assuming that s = 18,000 is a reasonable estimate for what sample size would be needed to ensure that we could estimate the true

djverab [1.8K]

Answer:

The minimum sample size required is 71.

Step-by-step explanation:

The (1 - <em>α</em>)% confidence interval for population mean is:

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

The margin of error for this interval is:

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

It is provided that the population standard deviation <em>σ</em> can be estimated by the sample standard deviation <em>s</em>.

The given information is:

<em>s</em> = 18000,

Margin of error = $4200.

Confidence level = 95%

The <em>z</em>-value for 95% confidence level is,

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

*Use a <em>z</em>-table for the critical value.

Compute the sample size required as follows:

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

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

$=[\frac{18000\times 1.96}{4200}]^{2}$

$=70.56\\\approx71$

Thus, the minimum sample size required is 71.

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3 years ago