Am sure it’s the 1 first option
Answer:
1 - 3.54 hours / total flight time - 4.54
2 - 15/22
Step-by-step explanation:
First, you need to find the speed of the plane for the rest of the flight.
In the last 2 hours, it flies 830 miles.
In the last 1/2 hour, it flies at 160 mph so it travels 80 miles.
So in the middle of the flight, it travels (830 - 80) = 750 miles in 1 1/2 hours
Speed = 500 mph
Now think about the whole flight. There is 1 hour at 160 mph plus x hours at 500 mph.
Distance = 160 + 500x = 1930
500x = 1770
x = 3.54 hours
Total flight time = x + 1 = 4.54 hours
The coefficient of determination r² is 0.769² = 0.591. This means that 59.1% of the data y can be explained by the linear relationship between x and y while the other 40.9% is still unexplained. The positive value for the correlation coefficient r means that as values for x increases, values for y also increase.
Answer:
The 95% confidence interval based on this sample is =
[6.41, 7.79]
Step-by-step explanation:
The formula for Confidence Interval =
Mean ± z × standard deviation/√n
Sample mean = 7.1 hours
Standard deviation = 5 hours
n = 200 students
z = 95% confidence interval z score
= 1.96
C.I = 7.1 ± 1.96 × 5/√200
C.I = 7.1 ± 0.693
Hence, Confidence Interval
= 7.1 - 0.693
= 6.407
Approximately = 6.41
= 7.1 + 0.693
= 7.793
Approximately = 7.79
Therefore, the 95% confidence interval based on this sample is
[6.41, 7.79]
Answer:
6q + 2
Step-by-step explanation:
4q + 2 % = 6q
3 - 1 = 2
6q + 2