2,412 ÷ 25. pls show your work 1,889 ÷ 36. pls show your work
2 answers:
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Answer: Choice B
Work Shown:
This says that x is between 1 and 4; it can equal 1, but it can't equal 4.
To visually represent this, we'll have a closed circle at 1, an open circle at 4, with shading in between these circles. This is represented by graph B.
In this problem, the given values are:
x = average = 30.4
s = standard deviation = 7.1
n = number of samples = 25
Degrees of freedom = n -1 =24
Using the t-distribution table for a normal curve at 90% CI, we get t-crit:
t-crit = 1.711
Now the Margin of Error (E) is calculated as:
E = t-crit*(s/ )
By substituting the known values into the equation:
E = 1.711 * (7.1/ )
E = +- 4.30
Therefore, the margin of error is 4.36. Hence, the commute time is between 26.1 minutes and 34.7 minutes.
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