On a clear day, you can see approximately 30.65 miles from the observation deck of Willis Tower in Chicago. Using the formula be
low, estimate the height in feet, h, of the observation deck. PLEASE PLEAE HELP ASAP PLEASE THE PROBLEM IS IN THE PICTURE.
2 answers:
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Answer:
b. The values X and Y are independent therefore, the mean is 34 seconds and the standard deviation is 50 seconds
Step-by-step explanation:
Subtraction between normal variables:
When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.
Before the training, the mean running time for the students to run a mile was 402 seconds with standard deviation 40 seconds.
This means that
After completing the program, the mean running time for the students to run a mile was 368 seconds with standard deviation 30 seconds.
This means that
Which of the following is true about the distribution of X-Y?
They are independent, so:
This means that the correct answer is given by option b.