Tires:
65(2) - 45(2) = 130 - 90 = $40 profit
Rims:
126(3) - 85(3) = 378 - 255 = $123 profit
Headlights:
15(5) - 5(5) = 75 - 25 = $50 profit
Total profit:
$40 + $123 + $50 = $213 profit
Answer:
Step-by-step explanation:
As per given , we have
n=11
df = 11-1=10
Since population standard deviation is unknown , so we use t-test.
Critical t-value :
Confidence interval for population mean :_
Hence, the 95% confidence interval for his mpg =
The answer is simply 12. Hope i have helped :)