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3 years ago

Q19. Four positive whole numbers add up to 36

Mathematics

1 answer:

MAXImum [283]3 years ago

7 0

Answer:

Step-by-step explanation:

let the numbers be 7x,y,y,y.

7x+3y=36

3y=36-7x

$y=\frac{36-7x}{3} \\let~x=3\\y=\frac{36-7 \times 3}{3} =\frac{15}{3} =5\\$

numbers are 7×3,5,5,5

or 21,5,5,5

21×5×5×5=2625

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3 years ago

At The Old Home Fill'er Up and Keep on a-Truckin' Cafe, Mavis mixes two different types of coffee beans to produce a house blend

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There are 45 pounds and 30 pounds of each type respectively.

Step-by-step explanation:

Since we have given that

Cost of first type = $2 per pound

Cost of second type = $7 per pound

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3 years ago

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3 years ago

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Answer and Step-by-step explanation:

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3 years ago

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Answer:

The critical value for this hypothesis test is 6.571.

Step-by-step explanation:

In this case the professor wants to determine whether the average number of minutes that a student needs to complete a statistics exam has a standard deviation that is less than 5.0 minutes.

Then the variance will be, $\sigma^{2}=(5.0)^{2}=25$

The hypothesis to determine whether the population variance is less than 25.0 minutes or not, is:

H₀: The population variance is not less than 25.0 minutes, i.e. σ² = 25.

Hₐ: The population variance is less than 25.0 minutes, i.e. σ² < 25.

The test statistics is:

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The decision rule is:

If the calculated value of the test statistic is less than the critical value, $\chi^{2}_{n-1}$ then the null hypothesis will be rejected.

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Thus, the critical value for this hypothesis test is 6.571.

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4 years ago

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