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sweet-ann [11.9K]
3 years ago
6

#4 ) The U.S., from 2004-2015... PLZ HELP I NEED IT TODAY

Mathematics
1 answer:
Keith_Richards [23]3 years ago
8 0
I think your answers are correct
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A random sample of 121 automobiles traveling on an interstate showed an average speed of 73 mph. from past information, it is kn
tatiyna

121 is big enough to assume normality and not worry about the t distribution. By the 68-95-99.7 rule a 95% confidence interval includes plus or minus two standard deviations. So 95% of the cars will be in the mph range


(73 - 2 \cdot 11, 73 + 2 \cdot 11) = (51,95)


The question is a bit vague, but it seems we're being asked for the 95% confidence interval on the average of 121 cars. The 121 is a hint of course.


The standard deviation of the average is in general the standard deviation of the individual samples divided by the square root of n:


\sigma = \dfrac{ 11}{\sqrt{121}} = 1


So repeating our experiment of taking the average 121 cars over and over, we expect 95% of the averages to be in the mph range


(73 - 2 \cdot 1, 73 + 2 \cdot 1) = (71,75)


That's probably the answer they're looking for.



4 0
3 years ago
HELP PLEASE SUPER QUICK, I'LL MARK AS BRAINLIEST!
olganol [36]

Answer:

More expensive: Miami, Honolulu

Less expensive: Seattle, Orlando

8 0
3 years ago
Read 2 more answers
WOULD YOU RATHER use a coupon for $20 off 10
tatiyna

Answer:

$20 off 10

Step-by-step explanation

it really depends on how much there is in your order, but if its more than 10 i would use $20 off 10 because its less stuff so the prices would go lower.. if that makes any sense

6 0
3 years ago
Which of the given functions could this graph represent? A. f(x) = x(x − 1)(x − 2)(x + 1)(x + 2) B. f(x) = x(x − 1)(x + 1) C. f(
zaharov [31]

Answer:

The answer is B. f(x) = (x − 1)(x − 2)(x + 1)(x + 2)

Step-by-step explanation:

5 0
3 years ago
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Recall that two angles are complementary if the sum of their measures is 90 degrees°. Find the measures of two complementary an
raketka [301]

Answer:

18° and 72°

Step-by-step explanation:

let x be the measure of one angle then the other is 3x + 18

The sum of the 2 complementary angles = 90°, hence

x + 3x + 18 = 90

4x + 18 = 90 ( subtract 18 from both sides )

4x = 72 ( divide both sides by 4 )

x = 18

the 2 angles are 18° and (3 × 18 ) + 18 = 72°


8 0
3 years ago
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