We know, 3 feet = 1 yard.
We have to convert feet to yards to calculate the ratio so that the final answer doesn't have any unit.
Therefore, 21 feet = = 7 yards
Thus, the ratio
The fraction is already in its simplest form.
Therefore, the given ratio as a fraction in the simplest form without any units is
Answer:
Step-by-step explanation:
Previous concepts
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
represent the sample mean for the sample
population mean (variable of interest)
s represent the sample standard deviation
n=5 represent the sample size
Solution to the problem
The confidence interval for the mean is given by the following formula:
(1)
And for this case we know that the 95% confidence interval is given by:
And the margin of error is given by:
And the margin of error is given by:
The degrees of freedom are given by:
And the critical value for 95% of confidence is
So then we can find the deviation like this:
And for the 99% confidence the critical value is:
And the margin of error would be:
And the interval is given by:
Answer:
Fraction of fire trucks =
Total number of toy cars =
Step-by-step explanation:
Fraction of sports car =
Fraction of remaining cars
So,
Fraction of pick up cars =
Therefore,
Fraction of fire trucks =
That is Number of fire trucks = ( Total number of toy cars )
Number of fire trucks = 4
Total number of toy cars =