Automobiles traveling on a road with a posted speed limit of 65 miles per hour are checked for speed by a state police radar system. The following is a frequency distribution of speeds. Speed (miles per hour) Frequency 45 up to 55 70 55 up to 65 360 65 up to 75 250 75 up to 85 110 (See the Excel Data File.) The mean speed of the automobiles traveling on this road is the closest to ________.
Answers
Answer:
The mean speed of the automobiles traveling on this road is the closest to 65 mph.
Step-by-step explanation:
frequency distribution of speeds.
Speed (mph) | Frequency
45 up to 55 | 70
55 up to 65 | 360
65 up to 75 | 250
75 up to 85 | 110
Using the midpoint method, we represent each group/class of speeds with the midpoint speed, then go ahead to compute the mean.
Let the speed be x
The frequency be f
x | f
50 | 70
60 | 360
70 | 250
80 | 110
Mean = (Σfx)/(Σf)
Σfx = (50×70) + (60×360) + (70×250) + (80×110) = 51,400
Σf = 70 + 360 + 250 + 110 = 790
Mean = (Σfx)/(Σf)
Mean = (51400/790) = 65.06 mph ≈ 65 mph
The mean speed of the automobiles traveling on this road is the closest to 65 mph
Hope this Helps!!!
Related Questions
Describe the transformation from the graph of f(x) = x + 3 to the graph of g(x) = x − 7.
0.05061 to 3 significant numbers
Hot air balloons are able to fly at a very high altitudes a world record height of 64997 feet was set in 1988 in 2005 a new record of 68986 feet was set how many feet higher was 2005 record than the 1988 récord first draw a diagram to show the parts of the problem
A garden hose fills a 2-gallon bucket in 5 seconds. The number of gallons, g, is proportional to the number of seconds, t, that the water is running. Select all the equations that represent the relationship between g and t. A g= 0.4tB t= 0.4GC g=2.5tD t=2.5gE g= 2/5 t
Answers
Answer:
The 90% confidence interval is
The sample size to develop a 95% confidence interval is
Step-by-step explanation:
From the question we are told that
The sample size is n =500
The sample proportion is
From the question we are told the confidence level is 90% , hence the level of significance is
=>
Generally from the normal distribution table the critical value of is
Generally the margin of error is mathematically represented as
=>
=>
Generally 90% confidence interval is mathematically represented as
=>
=>
From the question we are told the confidence level is 95% , hence the level of significance is
=>
Generally from the normal distribution table the critical value of is
The margin of error is given as
Generally the sample size is mathematically represented as
=>
=>
Answers
f(x)=f(x1)+f'(x1)(x-x1)
Then,
f(x)=f(1)+f'(1)(x-1)=7+2(x-1)
And,
f(0.8)=6.6
Answers
a. 297
b. 567
c. 837
d. I added the tens together and the units
4. a. 10
i don't know the rest
5. a. 0.68
b. 1.34
6. a. ???
b. 1 2/5
7. a. 0.50 - 1 - 06.00? - 700.00
b. 0.80 - 9 - 31.00? - 600.00
I think that's correct ;)
Answers
Answer:
2x squared +1 (-)x squared -7 is
a.) x squared +8
Step-by-step explanation:
:)
Answers
We are given number in words " two hundred fifty three thousandths".
Let us write it in number form: First we would write the number form of "two hundred fifty".
Two hundred fifty = 253.
Now, we need to write three thousandths.
Three thousandths = .003
Now, we need to combine 253 and 0.003.
On combining we get 253.003.
Therefore, two hundred fifty three thousandths in standard form is 253.003.
Answers
Answer:
Third choice, angle 5 and 2
Step-by-step explanation:
Vertical angles are opposite angles that are connected by intersecting lines.
5 and 2 are opposite angles and they are connected by, technically, two lines crossing each other.