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Slav-nsk [51]
3 years ago
8

A publishing company has just published a new college textbook. Before the company decides the price at which to sell this textb

ook, it wants to know the average price of such textbooks in the market. The research department at the company took a sample of 25 comparable textbooks and collected information on their prices. This information produced a mean of $145 for this sample. It is known that the standard deviation of all such textbooks is $35 and the population of such prices is normal.
a. What is the point estimate of the mean price of all such college textbooks?

b. Construct a 90% confidence interval for the mean price of all such college textbooks.
Mathematics
1 answer:
Kobotan [32]3 years ago
8 0

Answer:b

Step-by-step explanation:

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Which set of rational numbers are orders from least to greatest? A) -1, -1 1/2, -1 1/4, -1 7/8 B)-1 7/8, -1 1/2, -1 1/4, -1
Semmy [17]

Answer:

-1 7/8, -1 1/2, -1 1/4, -1

Step-by-step explanation:

First note that the negative value closer to zero on the number is greater. an those far from zero will be the least

According to the given option, we can first express the fractions as percentage as shown

-1 7/8 = -15/8 * 100 = -187.5%

-1 1/2 = -3/2 * 100 = -150%

-1 1/4 = -5/4 * 100 = -125%

-1 = -1 * 100 = -100%

Based on the explanation above, the least value is  -187.5%  and the greatest value is -100%

Rearranging from least to greatest is expressed as  -187.5%,-150%, -125%, -100%

According to their respective fractions;

-1 7/8, -1 1/2, -1 1/4, -1

6 0
2 years ago
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16. Construct 3 equations starting with x = 5.
strojnjashka [21]

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The equation is in the form of variable and constant equating.

Let the equation be x=5.

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<em><u>F</u></em><em><u>I</u></em><em><u>R</u></em><em><u>S</u></em><em><u>T</u></em><em><u> </u></em><em><u>W</u></em><em><u>E</u></em><em><u> </u></em><em><u>A</u></em><em><u>D</u></em><em><u>D</u></em><em><u> </u></em><em><u>5</u></em><em><u> </u></em><em><u>B</u></em><em><u>O</u></em><em><u>T</u></em><em><u>H</u></em><em><u> </u></em><em><u>S</u></em><em><u>I</u></em><em><u>D</u></em><em><u>e</u></em><em><u>,</u></em>

x + 5=5+5

=x + 5=10

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x — 5=5—5

=x—5=0

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5x=5×5

=5x=25

well u got the answer!

3 0
3 years ago
A sector of a circle has a central angle of 60°. find the area of the sector if the radius of the circle is 6 mi.
professor190 [17]
The entire circle has a central angle of 360°.
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The sector has a central angle of 60°, therefore it occupies 60/360 = 1/6 of the area of the circle.
The area of the sector is
(1/6)*36π = 6π mi² = 18.85 mi²

Answer: 6π mi²  or  18.85 mi².

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