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Andrews [41]
2 years ago
8

The ratio of red to black pens in a drawer is 4 to 7.

Mathematics
1 answer:
jeka57 [31]2 years ago
8 0
12 red, 21 black.

4/7 = 12/21

if you divide 12 by 3 it equals 4
if you divide 21 by 3 it equals 7
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In a recent school newspaper survey, 3,000 randomly selected teenagers were asked to cite their primary transportation method to
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Answer: There is a 90% chance that the true proportion of teenagers who drive their own car to school will lie in (0.5907, 0.9093).

Step-by-step explanation:

Interpretation of a% confidence interval : A person can be a% confident that the true population parameter lies in it.

Here, A 90% confidence interval to estimate the true proportion of teenagers who drive their own car to school is found to be (0.5907, 0.9093).

i.e. A person can be 90% confident that  the true proportion of teenagers who drive their own car to school lies in (0.5907, 0.9093).

Hence, correct interpretation is : There is a 90% chance that the true proportion of teenagers who drive their own car to school will lie in (0.5907, 0.9093).

7 0
3 years ago
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7 0
3 years ago
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Jim needs to rent a car. A rental company charges $21 per day to rent a car plus $0.80 per mile driven. How many miles can he dr
chubhunter [2.5K]

Answer:

Inequality: .80x +21 ≤ 82

Answer: 76.25 miles in total

Step-by-step explanation:

Hi,

An inequality to represent this is .80x +21 ≤ 82

(.80 is the cost per mile and x is the number of miles driven. 21 is the fee that must be paid no matter what and the 82 is the total cost they can pay. We use the ≤ sign to say they can spend less than or equal to 82. The phrase "at most" means we can use the ≤ sign).

Now we solve...

.80x + 21 ≤ 82

Subtract 21 on both sides...

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Now, divide by .80 on both sides...

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He can drive up to 76.25 miles in total

Hope this helps :)

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4 years ago
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