SOLUTION: 3.78 The mean time taken by all participants to run a road race was found to be 250 minutes with a standard deviation of 30 minutes. Using Chebyshev’s theorem, find the percentage

Algebra ->  Probability-and-statistics -> SOLUTION: 3.78 The mean time taken by all participants to run a road race was found to be 250 minutes with a standard deviation of 30 minutes. Using Chebyshev’s theorem, find the percentage      Log On


   

Question 935944: 3.78 The mean time taken by all participants to run a road race was found to be 250 minutes with a standard deviation of 30 minutes. Using Chebyshev’s theorem, find the percentage of runners who ran this road race in
A. 190 to 310 minutes B. 160 to 340 minutes C. 175 to 325 minutes
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
A. P = 1 - 1/2^2 = 3/4 0r 75%
B. P = 1 - 1/3^2 = 8/9
C. 75/30 = 2.5
P = 1 - 1/(2.5)^2 = .84 0r 84%