uppose that a category of world class runners are known to run a marathon (26 miles) in an average of 143 minutes with a standard deviation of 12 minutes. Consider 49 of the races.
Let
X
= the average times of the 49 races.
(a) Find the median of the average running times. ( That is, find the median of the sampling distribution of the average running times.)
Correct: Your answer is correct.
min
(b) Find the slowest 10 percent of the average running times. ( Round the answer to the second decimal place.)
min
(c) Find the fastest 10 percent of the average running times. ( Round the answer to the second decimal place.)
min
4 answers