Re: Contract bridge:standard deviation?


"Ray Johnstone"
A bridge hand of 13 cards has a mean value of 10 points (A4, K3, Q2,
J1) but what is the standard deviation?
You can grind out an estimate from this table of probabilities of the point
count in one hand:
0: .003639
1: .007884
2: .013561
3: .024624
4: .038454
5: .051862
6: .065541
7: .080281
8: .088922
9: .093562
10: .094051
11: .089447
12: .080269
13: .069143
14: .056933
15: .044237
16: .033109
17: .023617
18: .016051
19: .010362
20: .006435
21: .003779
22: .002100
23: .001119
24: .000559
25: .000264
26: .000117
27: .000049
28: .000019
29: .000007 (I held one of these once :) )
30: .000002
31-37: .000001
LH


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