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sesenic [268]
3 years ago
12

Past experience indicates that the time re- quired for high school seniors to complete a standard- ized test is a normal random

variable with a standard deviation of 6 minutes. test the hypothesis that σ = 6 against the alternative that σ < 6 if a random sample of the test times of 20 high school seniors has a standard deviation s = 4.51. use a 0.05 level of significance.
Mathematics
1 answer:
seropon [69]3 years ago
6 0
With a standard deviation of 6 minutes, we will test the hypothesis that σ = 6 against the alternative that σ < 6 if a random sample of the test times of 20 high school seniors has a standard deviation s = 4.51. use a 0.05 level of significance. <span /><span><span>
</span></span>
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Answer:

71, 72, 73

Step-by-step explanation:

So we want to find three consecutive integers that equal 216.

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Combine like terms:

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Subtract 3 from both sides:

3n=213\\

Divide 3 from both sides:

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So, the first term is 71.

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Candy bars are sold in a local store for 60 calends each. The factory has $1000 in fixed costs plus 10 cents of additional expen
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Given:

Candy bars are sold in a local store for 60 cents each. The factory has $1000 in fixed costs plus 10 cents of additional expense for each candy bar made.

To Find:

The break-even point.

Answer:

2000 candy bars have to be sold to break even.

Step-by-step explanation:

Let the break-even point be x candy bars. That is, the manufacturing cost to make x candy bars equals the money made by selling x candy bars (we see there is no profit, no loss. Simply, the cost price equals selling price).

The factory has to spend $1000 in fixed costs plus 10 cents for each candy bar as an additional expense.

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Also, for making x candy bars, the additional expense for the factory would be equal to 10x.

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Step-by-step explanation:

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