Margin of error is calculated using the following formula:
Margin error = Z-value*SD/Sqrt (N)
Where: Z -value at 95% confidence = 1.96; SD = Standard deviation = 10 minutes; N = Sample size; Margin error = 4 minutes
Substituting;
4 = 1.96*10/Sqrt (N)
Sqrt (N) = (1.96*10)/4 = 4.9
N = 4.9^2 = 24.01 ≈ 25
Therefore, 25 commuters will be selected at random to yield these results.
90 percent of 70 is 63.
The answer is 70.
B the answer is B
C the answer is C
Answer:
78.1777777778
Step-by-step explanation:
5 is not correct, as well as 87, and 74 r 4. so the 3rd answer is correct.