today math lesson

chapter 7 :probability

ns:{student in 5s3 which kena ns}

P(ns) : 13/39 = 1/3

conclusion:每3个5S3的学生就有一个中NS :)

for 5s5的學生中ns的人数: >60% = >20 person
只是一班都有20個人咯>.<
so terrible Lo ...


total number of people that i know in chung hwa that kena ns :>50


. **WA~我才发现原来我们中华生中ns的人数和速度居然和那些中 A H1N1的速度一样叻!! :)

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