Hello,
The answer to your question is....
2/3 + 3/8
= (2 × 8) + (3 × 3)
3 × 8
= 25/24 OR 1 1/24
Hope this helps!!!! Sorry I took so long :)
12 days. 60 is a quarter of 240. So, multiply 60 by 4 to get 240.
121 is big enough to assume normality and not worry about the t distribution. By the 68-95-99.7 rule a 95% confidence interval includes plus or minus two standard deviations. So 95% of the cars will be in the mph range

The question is a bit vague, but it seems we're being asked for the 95% confidence interval on the average of 121 cars. The 121 is a hint of course.
The standard deviation of the average is in general the standard deviation of the individual samples divided by the square root of n:

So repeating our experiment of taking the average 121 cars over and over, we expect 95% of the averages to be in the mph range

That's probably the answer they're looking for.
The Spanish influenza killed thousands in Mexico and millions worldwide in 1918.
The Influenza Epidemic surprisingly surpassed the total number of people dead in World War I, as more were killed from the epidemic. It ended up killing over more than 50 million people around the world. It was said that the flu pandemic was caused by tension of H1N1 flu and usually went after young, healthy adults.
$13.53 is the answer to you problem