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How many people are there in a 50-meter group in Tianjin Physical Education Examination?

Test in groups of at least two.

Test method:

Standing and starting, the subjects began to run after hearing the "run" password. The starter will wave the starting flag while giving the password, and the timekeeper will start timing according to the flag. When the subject's torso reaches the vertical plane of the finish line, the watch will stop and record the test results in seconds, accurate to one decimal place. When the second decimal place is not "0", it will input 1, such as 10.500000000006.

Precautions:

(1) Subjects are not allowed to wear spikes, leather shoes and plastic sandals.

(2) If anyone is found to have acted without authorization, he should be recalled to run for re-election.

(3) Run with the wind in case of wind.