Question 301427
4 R, 5 W, 3 B=12 total
P(R)=4/12=1/3
P(W)=5/12
P(R or W)=P(R)+P(W)=9/12=3/4
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I assume you meant 56, 46 and not 56.46.
Mean = 64.4
"5% trimmed mean" by definition means taking 2.5% values from top and 2.5% value from bottom and then re-taking the mean. Since there are 20 values, 5% is 1 value. I'll assume you mean 10% trimmed mean and 20% trimmed mean. 
5% trimmed mean (take out 14 and 100) = 65.2
10% trimmed mean (take out 14,46,88, and 100) = 64.9