2-3 random variables and their probability distribution in senior high school mathematics elective courses - Training Enrollment Network

2-3 random variables and their probability distribution in senior high school mathematics elective courses

Let P(x2)=p, then p (x 1) = p-d, and p (x3) = p+d.

P= 1/3 from p+(p-d)+(p+d)= 1.

From p-d= 1/3-d≥0, d≤ 1/3.

D≥- 1/3 from p+d= 1/3+d≥0.

So d∈[- 1/3, 1/3]

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(1) Sample size = 100÷2=500, then the third group frequency = 500-50-100-200-25 =125, and the figure is a supplement.

(2)∵ Median is the