A famous experiment detected 527 muons per hour at the top of Mt. Washington. New Hampshire. elevation 1910 m. At sea level. the same equipment detected 395 muons per hour. A discriminator selected for muons whose speed was between 0.9950c and 0.99S4c. Given that the mean lifetime T of a muon in a frame in which it is at rest is 2.2 ps and that in this frame the number of muons decays exponentially with time according to N — N0e-t1T. show that the results obtained in the experiment are sensible.